An organic compound "A" on treatment with benzene sulphonyl chloride gives compound B. B is soluble in dil. NaOH solution. Compound A is :

Question

C₆H₅ $-$ NHCH₂CH₃

C₆H₅ $-$ N $-$ (CH₃)₂

C₆H₅ $-$ CH₂NHCH₃

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