The meaning of aromatic hydrocarbons ; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes are to be stated. Concept introduction: The cyclic unsaturated hydrocarbon that exhibits alternate double and single bond are called as aromatic hydrocarbons. All the carbon atoms and C − C bonds are equivalent in the benzene ring. To determine: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes.

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 3RQ

Interpretation Introduction

Interpretation: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes are to be stated.

Concept introduction: The cyclic unsaturated hydrocarbon that exhibits alternate double and single bond are called as aromatic hydrocarbons.

All the carbon atoms and C−C bonds are equivalent in the benzene ring.

To determine: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes.

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Answer 2

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 3RQ

Interpretation Introduction

Interpretation: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes are to be stated.

Concept introduction: The cyclic unsaturated hydrocarbon that exhibits alternate double and single bond are called as aromatic hydrocarbons.

All the carbon atoms and C−C bonds are equivalent in the benzene ring.

To determine: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes.

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Answer 3

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 3RQ

Interpretation Introduction

Interpretation: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes are to be stated.

Concept introduction: The cyclic unsaturated hydrocarbon that exhibits alternate double and single bond are called as aromatic hydrocarbons.

All the carbon atoms and C−C bonds are equivalent in the benzene ring.

To determine: The meaning of aromatic hydrocarbons; justification for benzene exhibiting resonance; bond angles in benzene and the description of the bonding in benzene; and the reason for the difference in the delocalization of π electrons in benzene compared to the localized π electrons of alkenes and alkynes.

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Answer 4

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Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 21, Problem 3RQ

Interpretation Introduction