Chapter 20, Problem 42A

(a)

Interpretation Introduction

Interpretation:

The name of alcohol is to be written and classify as primary, secondary or tertiary alcohol.

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 42A

Pentanol, primary alcohol

Explanation of Solution

The name of compound is pentanol because it contains five carbon atom and −OH is attached to C-1 of the chain.

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

  

(b)

Interpretation Introduction

Interpretation:

The name of alcohol is to be written and classify as primary, secondary or tertiary alcohol.

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 42A

2-Methylbutan-2-ol, tertiary alcohol

Explanation of Solution

The name of compound is2-Methylbutan-2-ol because it contains four carbon atom and one −OH and one methyl is attached to C-2 of the chain.

2-Methylbutan-2-ol is tertiary alcohol because functional group $-OH$ is attached to tertiary carbon.

  

(c)

Interpretation Introduction

Interpretation:

The name of alcohol is to be written and classify as primary, secondary or tertiary alcohol.

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 42A

Pentan-3-ol, secondary alcohol

Explanation of Solution

The name of compound is pentan-3-ol because it contains five carbon atoms and −OH is attached to C-3 of the chain.

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

  

(d)

Interpretation Introduction

Interpretation:

The name of alcohol is to be written and classify as primary, secondary or tertiary alcohol.

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 42A

Propanol, primary alcohol

Explanation of Solution

The name of compound is propanol because it contains three carbon atom and −OH is attached to C-1 of the chain.

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