Alkenes and Their Reactivity Quiz

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Alkenes are more reactive than alkanes due to the presence of a weaker π bond in the C=C double bond.

True

The typical reaction of alkenes is ______ addition reactions.

electrophilic

What is the main reason why alkenes are more reactive than alkanes?

Alkenes have a higher number of carbon atoms.

Alkenes have a weaker π bond in the C=C double bond. (correct)

Alkenes have a stronger C-C bond.

Alkenes are more soluble in water.

What type of species are attracted to the electron-rich center of the C=C double bond in alkenes?

Electrophiles Signup and view all the answers

Match the following terms with their descriptions:

Electrophile = An electron-deficient species that attacks the π bond of an alkene. Carbocation = A positively charged species formed during the reaction of an alkene with an electrophile. Addition reaction = A reaction in which a molecule adds across a multiple bond, breaking the double or triple bond. π bond = The weaker bond in the C=C double bond that is easily broken by electrophiles. Signup and view all the answers

What is the primary structural requirement for a molecule to exhibit cis/trans isomerism?

Restricted rotation around a double bond. Signup and view all the answers

Cis and trans isomers have different chemical formulas.

False Signup and view all the answers

In a cis isomer, are the substituent groups on the same side or opposite sides of the double bond?

same side Signup and view all the answers

The rotation around a carbon-carbon double bond is generally ______.

restricted Signup and view all the answers

Match the isomer type to its description:

Cis isomer = Substituents on the same side of the double bond Trans isomer = Substituents on opposite sides of the double bond Signup and view all the answers

What is the functional group of alkenes?

Carbon-carbon double bond Signup and view all the answers

Alkenes are considered saturated hydrocarbons.

False Signup and view all the answers

What is the general formula for alkenes?

$C_nH_{2n}$ Signup and view all the answers

The first member of the alkene series is ______.

ethene Signup and view all the answers

Match the alkene with its boiling point:

Ethene = -104 °C Propene = -48 °C Butene = -6 °C Signup and view all the answers

What is the primary difference between cis and trans isomers that affects their boiling points?

The presence of dipole-dipole interactions in cis isomers. Signup and view all the answers

Trans isomers have a higher melting point because they pack more efficiently in the solid state.

True Signup and view all the answers

What type of intermolecular forces are present in both cis and trans isomers?

van der Waals dispersion forces Signup and view all the answers

The shape of the cis isomer is often described as ______, which hinders efficient packing in the solid phase.

U-shaped Signup and view all the answers

Match the isomer type with its corresponding property:

Cis Isomer = Higher boiling point, lower melting point Trans Isomer = Lower boiling point, higher melting point Signup and view all the answers

What is the primary catalyst used for the hydrogenation of alkenes?

Nickel Signup and view all the answers

Alkenes do not react with bromine solution under normal conditions.

False Signup and view all the answers

What does the reaction between ethene and hydrogen produce?

alkane Signup and view all the answers

The process of converting vegetable oil into margarine is known as _____.

hydrogenation Signup and view all the answers

Match the following reactions with their descriptions:

Hydrogenation = Formation of an alkane from an alkene and hydrogen Halogenation = Reaction of an alkene with bromine Bromination = Chemical test for unsaturated hydrocarbons Hydration = Addition of water to an alkene Signup and view all the answers

What product is formed when ethene reacts with concentrated $H_2SO_4$?

Hydrogensulfate(VI) Signup and view all the answers

Halogenation involves the reaction of alkenes with halogens to form alkanes.

False Signup and view all the answers

What is the byproduct produced when refluxing hydrogensulfate(VI) with water?

Sulfuric acid Signup and view all the answers

The process where ethene reacts with hydrogen halides is known as __________.

halogenation Signup and view all the answers

Match the following reactions with their corresponding products:

Ethene + $H_2SO_4$ = Hydrogensulfate(VI) Hydrogensulfate(VI) + H₂O = Ethanol Ethene + Halogen = Halogenoalkane Ethanol + H₂SO₄ = No significant product Signup and view all the answers

Alkenes and Their Reactivity Quiz

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Questions and Answers

Alkenes are more reactive than alkanes due to the presence of a weaker π bond in the C=C double bond.

The typical reaction of alkenes is ______ addition reactions.

What is the main reason why alkenes are more reactive than alkanes?

What type of species are attracted to the electron-rich center of the C=C double bond in alkenes?

Match the following terms with their descriptions:

What is the primary structural requirement for a molecule to exhibit cis/trans isomerism?

Cis and trans isomers have different chemical formulas.

In a cis isomer, are the substituent groups on the same side or opposite sides of the double bond?

The rotation around a carbon-carbon double bond is generally ______.

Match the isomer type to its description:

What is the functional group of alkenes?

Alkenes are considered saturated hydrocarbons.

What is the general formula for alkenes?

The first member of the alkene series is ______.

Match the alkene with its boiling point:

What is the primary difference between cis and trans isomers that affects their boiling points?

Trans isomers have a higher melting point because they pack more efficiently in the solid state.

What type of intermolecular forces are present in both cis and trans isomers?

The shape of the cis isomer is often described as ______, which hinders efficient packing in the solid phase.

Match the isomer type with its corresponding property:

What is the primary catalyst used for the hydrogenation of alkenes?

Alkenes do not react with bromine solution under normal conditions.

What does the reaction between ethene and hydrogen produce?

The process of converting vegetable oil into margarine is known as _____.

Match the following reactions with their descriptions:

What product is formed when ethene reacts with concentrated $H_2SO_4$?

Halogenation involves the reaction of alkenes with halogens to form alkanes.

What is the byproduct produced when refluxing hydrogensulfate(VI) with water?

The process where ethene reacts with hydrogen halides is known as __________.

Match the following reactions with their corresponding products:

What is the temperature required for the dehydration of alcohols to form alkenes?

Dehydration of alcohols can occur without the presence of a β-hydrogen.

What reagent is commonly used in the dehydration of alcohols to form alkenes?

Dehydrohalogenation occurs using hot, alcoholic _____ to form alkenes.

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