Question

Which of the following is the functional group of aldehydes?
(A)

(B)

(C)

(D) None of the above

Answer 1

Hint :A functional group is a group of atoms or bonds within a compound that is responsible for the compound's characteristic chemical reactions in organic chemistry. Regardless of the compound in which it is found, the same functional group can behave similarly and undergo identical reactions.

Complete Step By Step Answer:
A functional group is a substituent or moiety in a molecule that activates the molecule's characteristic chemical reactions in organic chemistry. Regardless of the remainder of the molecule's composition, the same functional group will undergo the same or identical chemical reactions.
An aldehyde is a chemical compound that contains a functional group with the form - CHO, which consists of a carbonyl centre bonded to hydrogen as well as some generic alkyl or side chain R group. An aldehyde or formal group is the functional group itself.
Esters (-COOR`) are a kind of functional group that is often used in organic chemistry. A carbon atom is bound to three other atoms: a single bond to another carbon, a double bond to an oxygen, and a single bond to an oxygen. At the carbonyl carbon, esters react with nucleophiles.
The carbonyl (C=O) and hydroxyl groups combine to form the carboxyl (COOH) group. Aldehydes, ketones, and carboxylic acids are formed as alcohols are oxidised. As organic compounds are oxidised, the number of bonds between carbon and oxygen increases, while the number of bonds between carbon and hydrogen decreases.
Hence option A is correct.

Note :
A carbonyl group is a functional group in organic chemistry that consists of a carbon atom double-bonded to an oxygen atom: C=O. It's found in a variety of organic molecules, and it's a component of much broader functional groups. A carbonyl compound is a chemical compound that contains a carbonyl group.