(i) Convert, acetamide into ethyl amine. (ii) Explain amphoteric nature of water.

Question 87 of 88

Q. (i) Convert, acetamide into ethyl amine.

(ii) Explain amphoteric nature of water.

Maharashtra MsbshseMaharashtra HSC (MSBSHSE) Board 2026Subjective· 3mImportance★★★★★

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Dehydration of acetamide gives acetonitrile, which on catalytic reduction gives ethylamine; water shows both acidic and basic (amphoteric) behaviour.

Acetamide to ethylamine: Step 1 — Dehydration: Acetamide is dehydrated using $P_2O_5$ (or POCl $_3$ ) on heating to give acetonitrile (methyl cyanide). $CH_3CONH_2 \xrightarrow[\Delta]{P_2O_5} CH_3-C\equiv N + H_2O$ Step 2 — Catalytic reduction: Acetonitrile is catalytically hydrogenated (reduced) with $H_2$ /Ni (or LiAlH $_4$ ) to ethylamine. $CH_3CN + 4[H] \xrightarrow{H_2/Ni} CH_3CH_2NH_2$
Amphoteric nature of water: Water can act as both a Brønsted acid (proton donor) and a Brønsted base (proton acceptor), so it is amphoteric. As an acid (donates $H^+$ to a stronger base, e.g. $NH_3$ ): …

Q.(i) Convert, acetamide into ethyl amine.