Chapter 2, Problem 81CP

(a)

Interpretation Introduction

Interpretation:

Functional group in the given molecule has to be identified.

Concept introduction:

Functional group: A group of atoms that gives the behavior of the chemical compounds.

Functional group of aldehyde is

Alcohol: It is an organic compound where it contains at least one $-OH$ group. It is represented as $ROH$.

Amides are an organic compound where it contains ${\text{-CO-NH}}_{\text{2}}$ as the functional group.

 Ether is an organic compound which contains $R\text{'}-O-R$ as the functional group, where $R\text{'}andR$ alkyl groups are.

 Alkene is hydrocarbons with $C=C$(double bond).

Aromatic Compounds: Compounds that are planar, cyclic and having $\left(4n+2\right)\pi$ electrons are known as aromatic compounds.

(b)

Interpretation Introduction

Interpretation:

The $\text{C-N}$ bond with restricted rotation has to be identified and explained.

Concept introduction:

Bonds are said to have restricted rotation when the groups on either end of the bond are frozen in one position, and it is not easy to flip between the two.

Restricted rotation is due to the partial double bond character.