Organic Chemistry I Mid-Exam

Questions and Answers

Which of the following statements about atomic weight is correct?

Atomic weight is the sum of protons and neutrons. (correct)

Atomic weight is equal to the number of electrons.

Atomic weight only refers to the weight of electrons.

Atomic weight is equal to the number of neutrons.

What type of bond is present in sodium iodide (NaI)?

Covalent bond

Hydrogen bond

Ionic bond (correct)

Metallic bond

Which functional groups are present in testosterone?

Alkane, ketone, and alcohol (correct)

Ketone and alcohol

Alkane and alkyne

Ester and alcohol

What is the bond angle in methane (CH4)?

Approximately 109.5 degrees Signup and view all the answers

Which statement about valence electrons is accurate?

They are responsible for chemical bonding. Signup and view all the answers

Why is ionic bonding generally considered stronger than covalent bonding?

Ionic compounds have higher melting points. Signup and view all the answers

What is a characteristic of coordinate bonding?

One atom donates both electrons to the bond. Signup and view all the answers

Which statement is true regarding the reaction of tetrachloromethane with aqueous silver nitrate?

No reaction is expected. Signup and view all the answers

What type of compound is menthol classified as?

Carbocyclic compound Signup and view all the answers

Which of the following statements about pinene is true?

There is one quaternary carbon present in pinene. Signup and view all the answers

Which IUPAC name is correct for a compound with the longest carbon chain containing nine carbons?

7-bromo-6-(sec-butyl)-3-ethyl-2,2-dimethylnonane Signup and view all the answers

Which option correctly lists the order of boiling points based on van der Waals attractions?

5 > 2 > 3 > 1 > 4 Signup and view all the answers

What is the correct chemical formula for the listed compounds?

C7H14, C3H4Cl2 & C5H8Br Signup and view all the answers

Which statement is true regarding cyclohexane?

Cyclohexane is a cyclic saturated hydrocarbon. Signup and view all the answers

How many tertiary carbons are present in menthol?

One Signup and view all the answers

Which compound is associated with both minor irritation and cough relief?

Menthol Signup and view all the answers

What is the bond angle in cyclohexane if it were planar?

120 degrees Signup and view all the answers

What occurs during the chair flip of cyclohexane when a methyl group is placed at position A?

The methyl group becomes equatorial Signup and view all the answers

What kind of interactions does a methyl group in an axial position experience in cyclohexane?

1,3-diaxial interactions Signup and view all the answers

If either A or B is a methyl group in cyclohexane, what percentage of the time is the preferred conformation present?

95% Signup and view all the answers

Which isomer is NOT a stereoisomer?

Isomer of hexane Signup and view all the answers

Which grouping of compounds would likely demonstrate similar chemical behavior?

1&6, 2&8, 3&4, 5&7 Signup and view all the answers

What is the correct IUPAC name for a compound that features both cyclobutyl and ethyl substituents?

3,4-diethyl-3-cyclobutylhexane Signup and view all the answers

What characterization applies to cis–trans pairs of 1,3-dichlorocyclohexane?

Cis-1,3-dichlorocyclohexane & trans-1,3-dichlorocyclohexane Signup and view all the answers

Which conformation of 1,3-dichlorocyclohexane is more stable?

Trans-1,3-dichlorocyclohexane is more stable. Signup and view all the answers

How many distinct monobromination products can be produced from butane (CH3CH2CH2CH3)?

3 Signup and view all the answers

What is the oxidation number of carbon in CO2?

3 Signup and view all the answers

Which characteristic applies to the bond in cis/trans-1,2-dimethylcyclopentane?

The bond is not rotatable. Signup and view all the answers

What color is produced from the combustion of alkanes?

Yellow Signup and view all the answers

Which statement regarding Cl2 and UV light is true?

Cl2 reacts under UV light to form radicals. Signup and view all the answers

If more than one answer matches in the matching section, what choice should be applied?

J Signup and view all the answers

Which option describes the stability of staggered anti conformations?

Staggered anti is more stable than eclipsed conformations. Signup and view all the answers

Study Notes

True or False Statements

Atomic weight does not equal the number of electrons; it is the weighted average of an element's isotopes.
Electrons do not collide with the nucleus; they occupy quantized energy levels.
Shell 2 can indeed contain s and p orbitals.
Valence electrons are crucial for chemical bonding and reactions.
The kernel of an atom includes the nucleus and inner electrons, not just inner electrons.
Gilbert Newton Lewis proposed that atoms achieve stability through sharing or transferring electrons, not just transfer.
Coordinate bonding is a type of covalent bond but is not the same as the typical bond in hydrochloric acid (HCl).
Ionic bonds are generally stronger than covalent bonds; diamond is an exception due to its strong covalent structure.
Sodium iodide (NaI) features an ionic bond between sodium and iodine.
No reaction occurs between tetrachloromethane (CCl4) and aqueous silver nitrate as CCl4 is nonpolar and does not react with ionic compounds.

Multiple Choice Questions

Testosterone contains functional groups including ketone, alcohol, and alkene.
Methane (CH4) is sp3 hybridized, primarily used as fuel with bond angles around 109.5 degrees.
Menthol is a carbocyclic compound; the carbon attached to the hydroxyl group is sp3 hybridized.
Pinene contains tertiary and quaternary carbons, while nicotine consists of two interconnected heterocyclic compounds.
For electron pair movement in structures, options are provided for illustration but are unspecified.
Correct IUPAC naming can include multiple structures leading to options A and C being correct.
Cyclohexane's bond angle is typically about 109.5 degrees, which affects axial and equatorial positioning of substituents.
Various compounds have unique formulas, requiring recognition for accurate identification.
Incorrect statements on cyclohexane relate to the misinterpretation of bond angles and methyl positioning.
Functional group similarity correlates compounds for similar chemical behavior, with various pairings possible.
IUPAC naming can lead to variations between compound name formulations, highlighting the nuances of nomenclature.
Cis-trans naming involves distinct isomers based on spatial arrangement of substituents around a double bond or ring.
Stability of cis vs. trans isomers usually favors the trans configuration due to less steric hindrance.
Monobromination products from alkanes can vary based on branching and symmetry.

Matching Questions

Understanding the stability and interactions within cycloalkanes is essential for structural integrity.
Yellow color in alkane combustion indicates incomplete combustion and the presence of soot.
Butane can exist in multiple conformations, with staggered conformations being more stable and desirable.
The presence of UV light initiates radical reactions in halogenation processes, leading to functional group transformations.
Recognizing oxidation states helps in balancing redox reactions and predicting chemical behavior.

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Description

This mid-exam covers important concepts from Organic Chemistry I, specifically tailored for 2nd semester students at Al-Bayan University. You'll encounter true or false questions assessing your understanding of atomic structure and electron behavior. Prepare yourself and test your knowledge!