Convert :
i. Ethanoic acid into methanamine
ii. Hexanenitrile into 1-aminopentane
iii. Methanol to ethanoic acid

Explanation

i. `underset ("Ethanoic acid" ) (CH_3COOH) underset (-SO_2.-HCl) overset(SOCl_2) (rarr) underset("Ethanoyl chloride") (CH_3COCl)`
`underset(-NH_(4)CI)overset(NH_(3)(Excess))rarr underset("Ethanamide")(CH_(3)CONH_(2)) underset(("Hofmann bromamide reaction"))overset(Br_(2)//KOH)rarr underset("Methananmine")(CH_(3)NH_(2))`
ii. `underset("Hexanenitrile")(CH_(3)(CH_(2))_(4)CN) overset(H_(3)O^(+))underset("Hydrolysis")rarr underset("Hexanoic acid")(CH_(3)(CH_(2))_(4)COOH)`
`underset(-SO_(2),-HCI)overset(SOCI_(2))rarrunderset(("Hofmann bromamide reaction"))overset(Br_(2)//KOH)rarr underset(1-"Aminopentane")(CH_(3)(CH_(2))_(4)NH_(2))`
iii. `CH_(3)OH overset(PCI_(5))underset(-POCI_(3))rarr CH_(3)CI overset(KCN)underset(alc.)rarr underset("Ethanenitrile")(CH_(3)CN) overset(H_(3)O^(o+))underset("Hydrolysis")rarr underset("Ethanoic acid")(CH_(3)COOH)`