Which of the following statements are correct ?
i) The activating effect of – NHCOCH₃ is more than that of – NH₂ group
ii) N-ethylbenzene sulphonamide is soluble in alkaline solution
iii) Aniline on reaction with concentrated H₂SO₄ followed by heating to 453-473K with concentrated H₂SO₄ gives p-aminobenzene sulphonic acid
iv) Alkyl isocyanide on reaction with HgO gives alkyl isocyanate

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i, ii, iv

iii, iv

ii, iii

ii, iii, iv

answer is C.

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Detailed Solution

Ethylbenzene sulphonamide is soluble in alkali because it has acidic hydrogen.

CH₃NC + HgO ----->CH₃N=C=O (majorproduct)

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