Chapter 20, Problem 51A

(a)

Interpretation Introduction

Interpretation:

The structural formula of the compound is to be written.

Concept introduction:

To write the structural formula, functional group, number of carbon atoms in the chain is to be identified.

Answer to Problem 51A

  

Explanation of Solution

Phenyl methyl ketone is common name of organic compound containing ketonic group.

A ketone has general formula $RCO{R}^{\text{'}}$

It means the two alkyl groups of ketone are phenyl and methyl. So the structure is:

  

(b)

Interpretation Introduction

Interpretation:

The structural formula of the compound is to be written.

Concept introduction:

To write the structural formula, functional group, number of carbon atoms in the chain is to be identified.

Answer to Problem 51A

  

Explanation of Solution

The name butanal shows compound contains aldehyde functional group.

Its general formula is $RCHO$ where $R$ is alkyL group.

The word-root ‘but’ shows compound contains chain of four carbon atoms. So the structure is:

  

(c)

Interpretation Introduction

Interpretation:

The structural formula of the compound is to be written.

Concept introduction:

To write the structural formula, functional group, number of carbon atoms in the chain is to be identified.

Answer to Problem 51A

  

Explanation of Solution

The name of organic compound shows compound contains ketonic group.

A ketone has general formula $RCO{R}^{\text{'}}$ As the number is not mentioned for keto group. So its position is C-2.

The name ‘but’ shows it has four carbon atoms.

So the structure is:

  

(d)

Interpretation Introduction

Interpretation:

The structural formula of the compound is to be written.

Concept introduction:

To write the structural formula, functional group, number of carbon atoms in the chain is to be identified.

Answer to Problem 51A

  

Explanation of Solution

Dipropyl ketone is common name of organic compound containing ketonic group.

A ketone has general formula $RCO{R}^{\text{'}}$

It means the two alkyl groups of ketone are propyl. So the structure is:

  

(e)

Interpretation Introduction

Interpretation:

The structural formula of the compound is to be written.

Concept introduction:

To write the structural formula, functional group, number of carbon atoms in the chain is to be identified.

Answer to Problem 51A

  

Explanation of Solution

The root name ‘heptan’ shows seven carbon atoms in the main chain which are single bonded.

  $\stackrel{7}{C}-\stackrel{6}{C}-\stackrel{5}{C}-\stackrel{4}{C}-\stackrel{3}{C}-\stackrel{2}{C}-\stackrel{1}{C}$

The suffix ‘one’ shows it is a ketonic group. Its position is C-4.

Thus, the structure is