91影视

Each organic functional group has a characteristic IR- absorption frequency. Based on that, the structure of the compound can be deduced.

The given spectrum indicates a broad peak at$3400鈥�c{m}^{-1},-2500鈥�c{m}^{-1}$ and confirms the presence of 鈥揙H group with C-H stretching.

A peak at$1710鈥�c{m}^{-1}$ represents the C=O stretch in carboxylic acid.

A peak at $1660鈥�c{m}^{-1}$represents C=C stretching.

From this data, it is clear that the given compound has the below shown structural formula:

Structure (a)

The given spectrum indicates the characteristic peak . This represents the C-H stretch.

A characteristic peak at$1710鈥�c{m}^{-1}$ represents the C=O stretch.

Hence, the structure of the compound is as shown below:

Structure (b)

The given spectrum indicates the characteristic peak $3000鈥�c{m}^{-1}-2840鈥�c{m}^{-1}$. This represents the C-H stretch.

A characteristic peak at$1710鈥�c{m}^{-1}$ represents the C=O stretch.

Hence, the structure of the compound is as shown below:

Structure (b)

The peak at$2900鈥�c{m}^{-1}$ represents the presence of C-H stretch.

The peak at $2260鈥�c{m}^{-1}$represents stretch.

The peak The peaks between $1600鈥�c{m}^{-1}-1400鈥�c{m}^{-1}$represents the C=C stretch in benzene.

Hence, the structure of the compound that represents the given IR spectrum is shown below:

Structure (c)

A characteristic broad IR peak $3500鈥�c{m}^{-1}-3300鈥�c{m}^{-1}$is observed .It represents the presence of O-H group.

A peak between $3000鈥�c{m}^{-1}-2800鈥�c{m}^{-1}$represents the C-H stretch.

The peaks between$1600鈥�c{m}^{-1}-1400鈥�c{m}^{-1}$ represents the C=C stretch in benzene.

Hence, the structure of the compounds for the given IR spectrum is as shown below:

Structure (d)