Chapter 22, Problem 1STP

Interpretation Introduction

Interpretation:

The products of the reaction need to be determined.

Concept introduction:

In a substitution reaction, one functional group is replaced by other functional group.

Answer to Problem 1STP

Correct Answer: Option (c)

Explanation of Solution

Reason for correct option:

The given reaction is as follows:

${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}\text{Br}+{\text{NH}}_{\text{3}}\to$

The given reaction is a substitution reaction, Here, lone pair of electrons on the N atom can attack on the C attached to Br which results in the removal of bromide ion along with one of the H atom attached to N atom to form HBr molecule. This results in the substitution of NH₂ group on the alkyl bromide.

The reaction will be as follows:

${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}\text{Br}+{\text{NH}}_{\text{3}}\to {\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{NH}}_{\text{2}}+\text{HBr}$

Thus, the products formed will be ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{NH}}_{\text{2}}$ and HBr.

Therefore, option (c) is correct.

Conclusion

Reason for incorrect option: The given reaction shows substitution mechanism thus, substitution of one functional group takes place at the place of other. The only possible products will be ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{NH}}_{\text{2}}$ and HBr. The other options are incorrect.