Chapter 20, Problem 43A

(a)

Interpretation Introduction

Interpretation:

The structural formula for given alcohol is to be written.

Concept introduction:

The general formula of alcohol is $R-OH$ .

The alcohols are named by using suffix ‘ol’.

The alcohols are classified as primary, secondary and tertiary on the basis of nature of carbon atom attached to $-OH$ group.

If carbon containing $-OH$ is attached to only hydrogen or one carbon, then alcohol is primary.

If carbon containing $-OH$ is attached to two carbon atoms, then alcohol is secondary.

If carbon containing $-OH$ is attached to three carbon atoms, then alcohol is tertiary.

Answer to Problem 43A

  

Explanation of Solution

The prefix ‘ol’ in 1- pentanol shows organic compound contains alcohol functional group where $-OH$

is attached to C-1. The word ‘pentan’ suggest it has five carbon atoms bonded by single bond. So the structural formula is:

  

1-pentanol is primary alcohol because functional group $-OH$ is attached to primary carbon.

(b)

Interpretation Introduction

Interpretation:

The structural formula for given alcohol is to be written.

Concept introduction:

The general formula of alcohol is $R-OH$ .

The alcohols are named by using suffix ‘ol’.

The alcohols are classified as primary, secondary and tertiary on the basis of nature of carbon atom attached to $-OH$ group.

If carbon containing $-OH$ is attached to only hydrogens or one carbon, then alcohol is primary.

If carbon containing $-OH$ is attached to two carbon atoms, then alcohol is secondary.

If carbon containing $-OH$ is attached to three carbon atoms, then alcohol is tertiary.

Answer to Problem 43A

  

Explanation of Solution

The prefix ‘ol’ in 2- pentanol shows organic compound contains alcohol functional group where $-OH$

is attached to C-2. The word ‘pentan’ suggest it has five carbon atoms bonded by single bond. So the structural formula is:

  

2-pentanol is secondary alcohol because functional group $-OH$ is attached to secondary carbon.

(c)

Interpretation Introduction

Interpretation:

The structural formula for given alcohol is to be written.

Concept introduction:

The general formula of alcohol is $R-OH$ . The alcohols are named by using suffix ‘ol’.

The alcohols are classified as primary, secondary and tertiary on the basis of nature of carbon atom attached to $-OH$ group.

If carbon containing $-OH$ is attached to only hydrogens or one carbon, then alcohol is primary.

If carbon containing $-OH$ is attached to two carbon atoms, then alcohol is secondary.

If carbon containing $-OH$ is attached to three carbon atoms, then alcohol is tertiary.

Answer to Problem 43A

  

Explanation of Solution

The prefix ‘ol’ in 3- pentanol shows organic compound contains alcohol functional group where $-OH$

is attached to C-3. The word ‘pentan’ suggest it has five carbon atoms bonded by single bond. So the structural formula is:

  

3-pentanol is seconary alcohol because functional group $-OH$ is attached to secondary carbon.

(d)

Interpretation Introduction

Interpretation:

The structural formula for given alcohol is to be written.

Concept introduction:

The general formula of alcohol is $R-OH$ . The alcohols are named by using suffix ‘ol’.

The alcohols are classified as primary, secondary and tertiary on the basis of nature of carbon atom attached to $-OH$ group.

If carbon containing $-OH$ is attached to only hydrogens or one carbon, then alcohol is primary.

If carbon containing $-OH$ is attached to two carbon atoms, then alcohol is secondary.

If carbon containing $-OH$ is attached to three carbon atoms, then alcohol is tertiary.

Answer to Problem 43A

  

Explanation of Solution

The prefix ‘ol’ in 3-Methyl-3- pentanol shows organic compound contains alcohol functional group where $-OH$

is attached to C-3. The word ‘pentan’ suggest it has five carbon atoms bonded by single bond. At c-3 one methyl group is attached as a substituent. So the structural formula is:

  

3-Methyl-3- pentanol is tertiary alcohol because functional group $-OH$ is attached to tertiary carbon.