Question

The waxes are long chain compounds of fatty acids,which belong to the class of
(A) Esters
(B) Ethers
(C) Alcohols
(D) Acetic acid

Answer 1

Hint: Fatty acids are those compounds which have sweet smelling compounds and are formed from the reaction between carboxylic acids and alcohols .They combines to form long chain compounds like waxes which are used in day to day life for a lot of purposes.

Complete Step by Step Solution:
Wax is a simple lipid which is used in day to day life and used in many of the purposes . Waxes are found in nature as coatings on leaves and stems . This lipid is formed basically from higher and longer chain fatty acids which are in turn made of esters . Esters are an important class of compounds which is manufactured by the reaction of an alcohol and carboxylic acid. This reaction is called as esterification reaction . For example the simplest esterification reaction is:
\[C{{H}_{3}}COOH+{{C}_{2}}{{H}_{5}}OH\xrightarrow{Esterification}C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}+{{H}_{2}}O\]

Similarly , waxes are the lipids which are esters of a long chain alcohol and fatty acids . Those alcohols are used which have almost 12-32 carbon atoms, long hydrocarbon chains and fatty acids which are mainly used in vegetable oils and all . The fatty acid has aliphatic tails consisting of 13-21 C atoms , resulting from the hydrolysis of neutral lipids . These long chain fatty acids are called LCFAs in short.
Thus, the correct option is A.

Note: It should be taken care that all those compounds which are made of long chain fatty acids are made up of esters only . It should not be confused with ethers as ethers are different classes of compounds; they contain only single oxygen bonds \[R-O-R'\] while in esters there are double oxygen bonds. The waxes ,perfumes and many more daily use items are made of esters.