Write the structural formula of the main product formed when , (i) The compound obtained by hydration of ethyne is treated with dilute alkali. (ii) Methanal reacts with ammonia.

Explanation

(i) `underset("Ethyne")(HC-=CH)+H_(2)Ooverset(Hg^(2+))tounderset("Ethanal")(CH_(3)CHO)overset(OH^(-))tounderset("Aldol")(CH_(3)-underset(OH)underset(|)(CH)-CH_(2)-CHO)`
(ii) `underset("hexa methylane tetramine (urotropine)")(6CH_(2)O+4NH_(3)to(CH_(2))_(6)N_(4)+6H_(2)O)`