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Write the structural formula of the main...

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.

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(i) `underset("Ethyne")(HC-=CH)+H_(2)O overset(Hg^(2+))rarr underset("Ethanal")(CH_(3)CHO) overset(OH^(-))rarr underset("aldol")(CH_(3)-underset(OH)underset("| ")"CH"-CH_(2))-CH`
(ii) `6CH_(2)O+4NH_(3) rarr (CH_(2))_(6)N_(4)+6H_(2)O`
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