Question

The basic group of an organic ester looks like:
A. $\text{ - CO - }$
B. $\text{ - COO - }$
C. $\text{ - CHO - }$
D. $\text{ - COOH - }$
E. $\text{ - O - }$

Answer 1

Hint: Esters are the carboxylic derivatives. They have pleasant odors such as smell like fruits (apples or bananas) and flowers, especially those with low molecular weight. Esters are prepared from a reaction called esterification.

Complete step by step answer:
Esters encompass a large family of organic compounds with broad application in medicine, biology, chemistry and industry.
The chemical formula of ester is $\text{RCOOR'}$. It is named after alcohol and carboxylic acid from which they are derived. $\text{R}$ part comes from alcohol and is named after it. $\text{R'}$ part comes from the acid and is named after it.
Esterification is the reaction of a carboxylic acid and alcohol in the presence of an acid catalyst to produce an ester.
Esters have a suffix –oate. The main chain of an ester comes from the carboxylic acid, while the alkyl group in an ester comes from the alcohol.
Now let’s consider the options. Option A is the basic group for a ketone. Option C is the group for aldehyde. And the option D is the group for an ether.
Thus the basic group of an organic ester looks like $\text{ - COO - }$ which is attached with the same or different alkyl groups.

Hence the correct option is B.

Note:
Esters can be prepared from three types of reactions:
-The reaction between an alcohol and a carboxylic acid to form an ester and water molecule.
-The reaction between acyl chloride and alcohol to form ester and hydrochloric acid.
-The reaction between acid anhydrides and alcohol to produce ester and carboxylic acids.