Question

The correct statement/statements from the options given below is/are:
(A) Diazonium salts of aromatic amines are less stable than diazonium salts of aliphatic amines.
(B) Ethylamine is insoluble in water.
(C) Gabriel phthalimide synthesis can be used to prepare primary amines.
(D) Because of +R-effect of–NH2 group, aniline will undergo Friedel-Crafts acylation reaction.
Choose the correct answer from the options given below:

• A. (A) and (B) only
• B. (A), (C) and (D) only
• C. (A) and (C) only
• D. (B), (C) and (D) only

Answer 1

The Correct Option is B

The problem involves evaluating statements regarding chemical compounds and reactions. Let's analyze each statement:

• (A) Diazonium salts of aromatic amines are more stable than those of aliphatic amines due to resonance stabilization, making the statement "A" correct.
• (B) Ethylamine is indeed soluble in water because it can form hydrogen bonds with water. Therefore, this statement is incorrect.
• (C) Gabriel phthalimide synthesis is used to prepare primary amines effectively by preventing issues like over-alkylation. Thus, statement "C" is correct.
• (D) Aniline's NH₂ group has a +R effect, making it less reactive in Friedel-Crafts acylation because it forms a complex with the Lewis acid catalyst, meaning statement "D" is correct.

Combining this analysis, the correct statements are (A), (C), and (D). Therefore, the answer is: (A), (C) and (D) only

Answer 2

(A) Diazonium salts of aromatic amines are less stable than diazonium salts of aliphatic amines:

• True: Diazonium salts of aromatic amines are generally less stable compared to diazonium salts of aliphatic amines. Aromatic diazonium salts tend to undergo nucleophilic substitution reactions more easily and are less stable due to the resonance stabilization of the aromatic ring.

(B) Ethylamine is insoluble in water:

• False: Ethylamine is soluble in water due to its ability to form hydrogen bonds with water molecules. The amino group (-NH₂) is polar and can interact with water, making ethylamine soluble.

(C) Gabriel phthalimide synthesis can be used to prepare primary amines:

• True: The Gabriel phthalimide synthesis is a method for preparing primary amines. It involves the reaction of phthalimide with an alkyl halide to form a primary amine.

(D) Because of +R-effect of –NH₂ group, aniline will undergo Friedel-Crafts acylation reaction:

• False: The +R-effect of the -NH₂ group in aniline makes the ring more reactive toward electrophilic aromatic substitution reactions, but it also inhibits Friedel-Crafts acylation due to the formation of a complex between the metal (AlCl₃) and the nitrogen atom, which prevents the acylation from occurring effectively.

The correct statements are (A), (C), and (D).

Therefore, the correct answer is Option B: (A), (C) and (D) only.