Which of the following statements are correct ?

i) The activating effect of $-{\mathrm{NHCOCH}}_3$ is more than that of  NH₂ group 

ii) N-ethylbenzene sulphonamide is soluble in alkaline solution

iii) Aniline on reaction with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ followed by heating to 453-473K with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ gives p-aminobenzene sulphonic acid

iv) Alkyl isocyanide on reaction with $\mathrm{HgO}$ gives alkyl isocyanate         

Given data: Find the correct statements among the given options

Detailed solution:

The $-{\mathrm{NHCOCH}}_3$ is deactivating group than $-N{H}_2$ group

In N-ethylbenzene sulphonamide the hydrogen attached to nitrogen is highly acidic due to presence of electron withdrawing group sulphonamide. Therefore it will dissolve in alkali solution 

Aniline on reaction with concentrated $H_{2}S{O}_4$ forms aniline hydrogen sulphate followed by heating at 453-473K it undrgorearange ment to give p-aminobenzene sulphonic acid

  Alkyl isocyanide on reaction with $HgO$ undergo oxidation to give alkyl isocyanate