AP EAMCET Medical 2017 Shift 1 Paper

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 - 473 K with concentrated H2SO4 gives p-aminobenzene sulphonic acidiv) Alkyl isocvanide on reaction with HgO gives alkyl isocyanate