An organic compound (A) of molecular formula C_2H_5NOon treatment with LiAIH_4gives (B) of formula C_2H_7N . (A) on treatment with Br_2and excess of caustic alkali gives (C) of formula CH_5N . (A) on treatment with phosphorous pentoxide gives (D) of molecular formula C_2 H_3 NIdentify A,B,C,D and explain the reactions involved.

An organic compound (A) of molecular formula C_2H_5NOon treatment with

1.	An organic compound (A) of molecular formula C_2H_5NOon treatment with LiAIH_4gives (B) of formula C_2H_7N . (A) on treatment with Br_2and excess of caustic alkali gives (C) of formula CH_5N . (A) on treatment with phosphorous pentoxide gives (D) of molecular formula C_2 H_3 NIdentify A,B,C,D and explain the reactions involved.
Answer» Solution :(i) The ORGANIC COMPOUND (A) is identified as `CH_3CONH_2`acetamide. (ii) Acetamide on treatment with `LiAlH_4`gives ethylamine as product (B) `underset("acetamine (A)")(CH_3- undersetoverset(\|\|)(O)(C ) -NH_2 + 4[H]) overset(LiAIH_4)(to) underset("ethylamine (B) ")(CH_3-CH_2-NH_3+H_2O)` (iii) Acetamide on reaction with `Br_2` and caustic alkali gives METHYL AMINE as (C ) `CH_3- undersetoverset(\|\|)(O)(C ) -NH_2 + B_2 + 4KOHtounderset("methyl amine (C )")(CH_3NH_2) + K_2CO_3 + KBr + 2H_2O` (iv) Acetamide on treatment with `P_2O_5` gives Aceto nitrile (or) methyl cyanide as (D) `CH_3 - undersetoverset(\|\|)(O)(C )-NH_2 underset(Delta)overset(P_2O_5)(to) underset("methyl cyanide(D )")(CH_3-C-= N + H_2O)`