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Standard XII

Chemistry

Decarboxylation Reaction of Alkanes

An organic co...

Question

An organic compound (A) $C_{7} H_{6} O$ has the smell of bitter almonds. Compound (A) reacts with ammonia to give compound (B) $C_{21} H_{18} N_{2}$ . Compound (A) also reacts with dilute alcoholic $K C N$ to form compound (C) $C_{14} H_{12} O_{2}$ . Identify (A), (B) and (C). Explain the reactions.

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Solution

$3 C_{6} H_{5} - C H O (A - Benzaldehyde) + 2 N H_{2} ⟶ C_{6} H_{5} C H {(C_{6} H_{5} C H = N)}_{2} (B - Hydro benzamide) + 3 H_{2} O$
$2 C_{6} H_{5} - C H O (A - Benzaldehyde) Alc. K C N - ----- \to C_{6} H_{5} - O H | C H - C O - C_{6} H_{5} (C - Benzoin)$
Hence the compound $A, B$ and $C$ are benzaldehyde, hydro benzamide and benzoin respectively.

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An organic compound (A) C7H6O has the smell of bitter almonds. Compound (A) reacts with ammonia to give compound (B) C21H18N2. Compound (A) also reacts with dilute alcoholic KCN to form compound (C) C14H12O2. Identify (A), (B) and (C). Explain the reactions.

3C6H5−CHO(A−Benzaldehyde)+2NH2⟶C6H5CH(C6H5CH=N)2(B−Hydro benzamide)+3H2O2C6H5−CHO(A−Benzaldehyde)Alc. KCN−−−−−−→C6H5−OH|CH−CO−C6H5(C−Benzoin)Hence the compound A,B and C are benzaldehyde, hydro benzamide and benzoin respectively.