Chapter 2, Problem 54P

Interpretation Introduction

Interpretation:

A structure for A and two possible structures for B are to be proposed based on the given information.

Concept introduction:

Infrared spectroscopy is a simple, instrumental technique, which helps to determine the presence of various functional groups.

It depends on the interactions of atoms or molecules with the electromagnetic radiation.

In IR spectroscopy, the $=\text{C}-\text{H}$ stretching frequency shows absorption band at $3080{\text{ cm}}^{-1}$.

The $-\text{C}=\text{C}$ stretching frequency shows absorption band at $1620{\text{ cm}}^{-1}$

The $-\text{OH}$ functional group shows absorption band at $3600{\text{ cm}}^{-1}$

Ketone functional group shows absorption band at $1750{\text{ cm}}^{-1}$.

The $-\text{C}-\text{C}-\text{H}$ stretching frequency shows absorption band at $2900{\text{ cm}}^{-\text{1}}$.

The higher the ring strain, the higher will be the stretching frequency.