Organic Chemistry Quiz: Alkanes and Alkenes

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Questions and Answers

What is the correct structural formula for 2-Methylpropane?

  • CH3-CH(CH3)-CH3 (correct)
  • CH2=CH-CH2-CH3
  • CH3-CH(CH3)-CH2-CH3
  • CH3-CH2-CH2-CH3

Which alkyl group corresponds to the compound C3H9?

  • Butyl
  • Ethyl
  • Methyl
  • Propyl (correct)

What is the primary structural feature that distinguishes phenol from toluene?

  • Presence of a carbon chain
  • Presence of an amine group
  • Presence of a hydroxyl group (correct)
  • Presence of a methyl group

What is the IUPAC name for the compound with the formula C4H10?

<p>Butane (D)</p> Signup and view all the answers

Which of the following represents the propyl structure correctly?

<p>CH3-CH2-CH3 (A)</p> Signup and view all the answers

Which IUPAC name corresponds to the compound with the structure CH3 - CH - CH2 - CH2 - CH - CH3 with an isopropyl group?

<p>3ethyl, 2, 2 dimethyl pentane (A)</p> Signup and view all the answers

What is the correct common name for the IUPAC name '1 methyl propyl'?

<p>Secondary Butyl (C)</p> Signup and view all the answers

Which of the following structures represents '2, 3 Dimethyl pentane'?

<p>CH3 - CH - CH - CH2 - CH3 (D)</p> Signup and view all the answers

What is the general formula for alkanes?

<p>CnH2n+2 (D)</p> Signup and view all the answers

In naming alkanes, when both methyl and ethyl are present in the parent chain, how should they be listed?

<p>In alphabetical order (C)</p> Signup and view all the answers

Which of the following correctly represents the general formula for alkynes?

<p>CnH2n-2 (C)</p> Signup and view all the answers

What is a characteristic feature of homologous series?

<p>Two consecutive members differ by CH2. (A)</p> Signup and view all the answers

Which compound is considered a cyclic compound?

<p>Benzene (C6H6) (A)</p> Signup and view all the answers

In naming organic compounds, what should be disregarded in the alphabetical order?

<p>Di and Tri prefixes of simple substituents (A)</p> Signup and view all the answers

What is the degree of unsaturation (DU) for the compound C6H4ClNO2?

<p>5 (A)</p> Signup and view all the answers

Which compound is a member of the alcohol family?

<p>C2H5OH (B)</p> Signup and view all the answers

Which of the following is true about alicyclic compounds?

<p>They contain only carbon atoms in a ring structure. (C)</p> Signup and view all the answers

What distinguishes heterocyclic compounds from homocyclic compounds?

<p>Presence of other atoms in the ring (C)</p> Signup and view all the answers

Which suffix is used for a compound that contains two carbon-carbon double bonds?

<p>-diene (D)</p> Signup and view all the answers

What is the correct name for a compound with the molecular structure CH2=CH-CH2-CH3?

<p>But-2-ene (B)</p> Signup and view all the answers

For a compound with a carbon-carbon triple bond, which suffix is appropriate?

<p>-yne (D)</p> Signup and view all the answers

What is the specific name when there is one carbon-carbon double bond combined with one carbon-carbon triple bond?

<p>Enyne (D)</p> Signup and view all the answers

Which prefix is used for a four-carbon alkane?

<p>But- (B)</p> Signup and view all the answers

Which of the following represents a compound that cannot exist as an alkene?

<p>C1H2 (B)</p> Signup and view all the answers

What is the correct nomenclature for a compound with 3 carbon atoms and one double bond?

<p>Propene (D)</p> Signup and view all the answers

What discovery by Wohler challenged the vital force theory?

<p>Formation of urea from ammonia cyanate (B)</p> Signup and view all the answers

Which of the following is an example of an alkene?

<p>C2H4 (D)</p> Signup and view all the answers

What is the primary characteristic of a tertiary carbon atom?

<p>It cannot be connected to more than three other carbons. (A)</p> Signup and view all the answers

What is the molecular formula representation for the hydrocarbon with the structure CH3-CH2-CH2-CH3?

<p>C4H10 (C)</p> Signup and view all the answers

How are saturated hydrocarbons characterized?

<p>They contain only single bonds. (A)</p> Signup and view all the answers

Which hybridization corresponds to the tetrahedral structure of methane (CH4)?

<p>Sp3 (D)</p> Signup and view all the answers

What term describes hydrocarbons with at least one triple bond?

<p>Alkynes (D)</p> Signup and view all the answers

Which of the following represents an unsaturated hydrocarbon?

<p>C2H4 (C)</p> Signup and view all the answers

What is the correct IUPAC name for the compound with the structure CH3 - C = C - CH3?

<p>2,3-Dimethylpent-2-ene (C)</p> Signup and view all the answers

Which of the following is the correct formula for ethyne?

<p>C2H2 (A)</p> Signup and view all the answers

What is the IUPAC name for the compound represented by CH≡C - CH2 - CH3?

<p>1-Butyne (C)</p> Signup and view all the answers

Which structure corresponds to cyclohexane?

<p>C6H12 (A)</p> Signup and view all the answers

The structure CH3 - C(=O)OU is combined with a carbon chain. Which functional group does it represent?

<p>Ester (D)</p> Signup and view all the answers

What is the correct IUPAC name for a compound with the formula C4H6?

<p>But-2-yne (C)</p> Signup and view all the answers

Which of the following is the proper nomenclature for a three-carbon alkyne?

<p>Propyne (D)</p> Signup and view all the answers

What indicates that a compound belongs to the carboxylic acid family?

<p>Presence of -COOH group (C)</p> Signup and view all the answers

Flashcards

Organic Compounds (Berzelius's definition)

Compounds initially thought to be produced only by living organisms.

Vital Force Theory

A theory stating that organic compounds could only be made by living organisms and not synthetically in a lab.

Wohler's Synthesis of Urea

A chemical reaction where urea, an organic compound, was synthesized from ammonium cyanate, an inorganic compound, disproving the vital force theory.

Hydrocarbons

The simplest organic compounds containing only hydrogen and carbon.

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Saturated Hydrocarbons (Alkanes)

Hydrocarbons with single bonds between carbon atoms.

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Unsaturated Hydrocarbons (Alkenes)

Hydrocarbons with at least one double bond between carbon atoms.

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Structural Formula of Organic Compounds

The specific arrangement of atoms and bonds in a molecule, showing the connections between them.

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Hybridization in Organic Chemistry

A process where atomic orbitals mix to form new hybrid orbitals, contributing to the shape of a molecule.

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Pri

A prefix used when a hydrocarbon chain has a side branch.

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Open Chain Hydrocarbon

An open chain hydrocarbon is defined as a chain of carbon atoms that is not closed to form a ring. It is a straight or branched chain.

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Nomenclature

The process of naming an organic compound based on its structure.

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Lowest Locant Rule

A method used to name alkanes with multiple side branches (substituents) by assigning numbers to the carbon atoms in the longest continuous chain.

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CnH2n+2

The general formula for alkanes, where 'n' represents the number of carbon atoms.

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Alkyl

A side substituent or side chain attached to a main carbon chain in an organic molecule.

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IUPAC Nomenclature

A standard system for naming organic compounds, formulated by the International Union of Pure and Applied Chemistry.

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Nomenclature of Organic Compounds

The systematic and standardized way of naming and classifying organic compounds based on their structure and functional groups.

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Root Word

The base name of an organic compound determined by the longest continuous carbon chain in its structure.

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Suffix

A suffix added to the root word in the IUPAC nomenclature to indicate the type of functional group present in the organic compound.

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Homologous Series

A series of organic compounds with the same functional group and a general formula, where each consecutive member differs by a CH2 unit.

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Cyclic Compound

A compound containing a ring of carbon atoms.

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Homocyclic Compound

A cyclic compound whose ring is made up of only carbon atoms.

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Heterocyclic Compound

A cyclic compound whose ring is made up of carbon atoms and other types of atoms.

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Straight Chain Compound

A compound with a straight chain of carbon atoms.

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Branched Chain Compound

A compound with a branched chain of carbon atoms.

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Double Bond Equivalents (DBE)

A measure of the degree of unsaturation in a molecule, representing the number of rings and/or pi bonds.

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Alicyclic Compound

A compound with a simple, non-aromatic ring structure consisting of only carbon atoms.

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Primary/Secondary Prefix

Names for the number of carbon atoms in a hydrocarbon compound, used as prefixes, for example, "meth" for one carbon atom.

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Functional Group

Groups of atoms attached to a hydrocarbon chain, responsible for the compound's chemical properties.

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-ane

A suffix added to the primary prefix for compounds with single bonds between carbon atoms.

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-ene

A suffix added to the primary prefix for compounds with double bonds between carbon atoms.

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-yne

A suffix added to the primary prefix for compounds with triple bonds between carbon atoms.

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Side Chain/Substitution

A branch or side chain attached to the main carbon chain, impacting the compound's structure.

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Numbers before the suffix of a hydrocarbon name

Indicating the position of a double or triple bond within a hydrocarbon chain.

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Naming Hydrocarbons

A convention in naming organic compounds where the longest continuous carbon chain is identified, followed by the position and type of functional groups and substituents.

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Alkenes

Alkenes are hydrocarbons with at least one carbon-carbon double bond. They follow the general formula CnH2n, where 'n' is the number of carbon atoms.

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Alkanes

Alkanes are hydrocarbons with only single bonds between carbon atoms. They follow the general formula CnH2n+2, where 'n' is the number of carbon atoms.

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Cyclo Alkanes

Cycloalkanes are cyclic hydrocarbons with carbon atoms forming a closed ring. They have the general formula CnH2n, where 'n' is the number of carbon atoms in the ring.

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Priority Order of Functional Groups

The priority order of functional groups determines the main group that influences the name of a molecule. It's a hierarchy based on the group's effect on the molecule's properties.

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Carboxylic Acid

Carboxylic acids are organic compounds with a -COOH group. They are named by using the prefix 'alkanoic acid' and counting the carbon atoms, including the one in the carboxyl group.

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Study Notes

Organic Chemistry Study Notes

  • Berzelius: Proposed a "vital force theory" explaining organic compounds' formation from living things.
  • Wöhler: Disproved the vital force theory by synthesizing urea, an organic compound, from inorganic materials. This was a landmark moment in organic chemistry and vitalism was debunked.
  • Organic Compounds: Formed from waste products of living organisms.
  • Hydrocarbons: Organic compounds containing carbon and hydrogen.
  • Saturated Hydrocarbons: Hydrocarbons containing single bonds between carbon atoms.
    • Alkanes: General formula CnH2n+2. Examples: Methane (CH4), Ethane (C2H6). -Substituted Alkanes include Chlorine, Chlorine, Hydroxyl and and Amines as examples
  • Unsaturated Hydrocarbons: Hydrocarbons with double or triple bonds between carbon atoms.
    • Alkenes: General formula CnH2n. Examples: Ethene (C2H4), Propene (C3H6).
    • Alkynes: General formula CnH2n-2. Examples: Ethyne (C2H2), Propyne (C3H4).

Saturated Representation of Organic Compounds

  • Molecular Formula (M.F.): Represents the number of atoms of each element in a molecule. Example: C4H10.
  • Condensed Structural Formula (CSF): Shows the connectivity of atoms in a molecule using a condensed format. Example: CH3-CH2-CH2-CH3.
  • Expanded Structural Formula (ESF): Presents the complete structure, including all bonds and atoms. A more detailed representation.

Hybridisation

  • Geometric Shape: Molecules achieve their most stable configuration.
  • Hybridisation: A concept related to atomic orbitals. The mixing of atomic orbitals.

Degree of Carbon

  • Primary (1°C): Connected to only one other carbon atom. Example: CH3.
  • Secondary (2°C): Connected to two other carbon atoms. Example: CH2-CH3.
  • Tertiary (3°C): Connected to three other carbon atoms. Example: CH-CH3.
  • Quaternary (4°C): Connected to four other carbon atoms. Example: C(CH3)4.

Degree of Hydrogen

  • Primary (1° Hydrogen): Attached to a primary carbon atom.
  • The degree of hydrogen can be determined by the degree of associated carbon atom

Degree of Unsaturation (DU)

  • DU is a measure indicating the number of pi bonds and/or rings present in a molecule. It's commonly used to help analyze organic structures.

Aromatic Compounds

  • Aromatic compounds must obey the Huckel's rule that the total number of pi electrons in a conjugated ring system must be 4n + 2 where n =any integer (ex, 0, 1 ,2, ...,). They need to be planar conjugated and cyclic.

Homologous Series

  • A homologous series is a group of similar organic compounds with a consistent difference in their molecular formula (example a CH2 difference), leading to repeated patterns in properties and reactions.

Naming of Organic Compounds

  • IUPAC (International Union of Pure and Applied Chemistry) rules outline systematic naming procedures for all organic compounds.
    • Rules and nomenclature of important functional groups (i.e. alkane, alkene, alkyne, alcohols, ethers, aldehyde,ketones, and carboxylic acids etc.)
    • Understanding prefixes and suffixes in naming processes.

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