A liquid X ( $C X_{8} H X_{11} N$ ) gives no foul-smelling compound on warming with $CHCl X_{3}$ and alcoholic KOH. When shaken with benzenesulphonyl chloride and aqueous KOH it is recovered unchanged as an oil, which dissolves in dilute HCl. X is

A2,4-dimethylaniline
B $C X_{6} H X_{5} CH X_{2} CH X_{2} NH X_{2}$
CN-ethylaniline
DN,N-dimethylaniline

Answer: D

The negative carbylamine test rules out the primary amines 2,4-dimethylaniline and 2-phenylethanamine. No sulphonamide formation and recovery of the basic oil mean a tertiary amine. N-Ethylaniline is secondary and would give an insoluble sulphonamide. X is

C X_{6} H X_{5} N (CH X_{3}) X_{2}

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A liquid X (CX8​HX11​N) gives no foul-smelling compound on warming with CHClX3​ and alcoholic KOH. When shaken with benzenesulphonyl chloride and aqueous KOH it is recovered unchanged as an oil, which dissolves in dilute HCl. X is

Answer: D

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A liquid X ( $C X_{8} H X_{11} N$ ) gives no foul-smelling compound on warming with $CHCl X_{3}$ and alcoholic KOH. When shaken with benzenesulphonyl chloride and aqueous KOH it is recovered unchanged as an oil, which dissolves in dilute HCl. X is