Consider the following statements about the uses of amines and their compounds.
(A) Novocain, a synthetic amino compound, is used as an anaesthetic in dentistry.
(B) Benadryl, a well known antihistaminic drug, contains a secondary amino group.
(C) Quaternary ammonium salts are used as surfactants.
(D) Primary amines like methylamine are used as insect attractants.
(E) Diazonium salts are intermediates in the preparation of a variety of aromatic compounds including dyes.
Which of the statements given above are incorrect? Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (B) and (D) only
Amines and their salts have many uses as drugs, surfactants and starting materials. Here the class of amino group in each compound decides two of the statements.
(A) Novocain, a synthetic amino compound, is used as an anaesthetic in dentistry. — Correct statement.
(B) Benadryl, a well known antihistaminic drug, contains a secondary amino group. — Incorrect statement. Benadryl contains a tertiary amino group.
It is adrenaline and ephedrine that contain a secondary amino group.
(C) Quaternary ammonium salts are used as surfactants. — Correct statement.
(D) Primary amines like methylamine are used as insect attractants. — Incorrect statement. It is tertiary amines like trimethylamine that are used as insect attractants.
(E) Diazonium salts are intermediates in the preparation of a variety of aromatic compounds including dyes. — Correct statement. Their diazonium group can be replaced by many groups, and their coupling gives azo dyes.
NCERT (2026-27 edition):
Unit 9 Amines – “…Novocain, a synthetic amino compound, is used as an anaesthetic in dentistry. Benadryl, a well known antihistaminic drug also contains tertiary amino group. Quaternary ammonium salts are used as surfactants. Diazonium salts are intermediates in the preparation of a variety of aromatic compounds including dyes.”
Summary – “…Tertiary amines like trimethylamine are used as insect attractants.”