Question

Identify Z in the following reaction sequence:
$C{H_3}C{H_2}Br\xrightarrow{{KCN}}X\xrightarrow{{dil.HCl}}z$
A. $C{H_3}COCl$
B. $C{H_3}CON{H_2}$
C. $C{H_3}COOH$
D. $C{H_3}C{H_2}COOH$

Answer 1

Substitution reaction is a chemical reaction during which one functional group in a chemical compound is replaced by another functional group. These reactions are of prime importance in organic chemistry.

Complete step by step answer:
Ethyl bromide is a chemical compound of the haloalkanes group. This volatile compound has an ether like odour.
When ethyl bromide reacts with KCN, it undergoes substitution reaction to form ethyl cyanide.
This ethyl cyanide reacts with dil. HCl, it forms propanoic acid as a product.
$C{H_3}C{H_2} - Br\xrightarrow{{KCN}}C{H_3}C{H_2}CN\xrightarrow[\Delta ]{{dilHCl}}C{H_3}C{H_2}COOH$
Propanoic acid is a naturally occurring carboxylic acid with chemical formula $C{H_3}C{H_2}C{O_2}H$. It is a liquid with a pungent and unpleasant smell somewhat resembling body odor.
The anion $C{H_3}C{H_2}C{O_2}^ -$ as well as the salts and esters of propionic acid are known as propionates or proponates.

Hence, option D is correct.

Note:
The intermolecular forces present in propanoic acid are hydrogen bonds, dipole-dipole forces and London dispersion forces. It is used as a preservative and flavoring agent in various types of packed foods. This includes cheese but also baked goods like tortillas and bread.