Which of the following statements is correct?

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Aliphatic amine forms stable diazonium salt with nitrous acid

All amino compounds can be distinguished by using the reagents chloroform and potassium hydroxide.

Base-weakening substituents are the one that activate an aromatic ring toward electrophilic substitution

The sulphonamide formed from secondary amine does not form sodium salt and is also insoluble in water

answer is D.

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Detailed Solution

(a) Electron-releasing groups are aromatic-ring activators and they also push electrons toward nitrogen making lone pair of electrons more readily available for an acid. Hence, they are base-strengthening groups. Electron with drawing groups act in the opposite direction, hence, they are base-weakening group.

(b) Aliphatic amines form unstable diazonium salt which decompose to give nitrogen and aliphatic alcohols.

${RNH}_{2} + {CHCl}_{3} + 3 KOH \to RNC + 3 KCl + 3 H_{2} O$