Write structures of compounds A, B and C in each of the following reaction: (i) {\C}_6 {\H}_5 {\Br} \stackrel{ {\Mg}{─────▸} \/ \text{ dry ether }} \A {─────▸}_{\text{ (b) } {\H}_3 {\O}^{+}}^{ (\a) \CO_{2(\g)}} \B \stackrel{ {\PCl}{ ───▸}_3} {\C} (ii) \CH_3\CN \stackrel{(\a) {\SnCl}{─────▸}_2 \/ {\HCl}}_{{\text{ (b) } {\H}_3 {\O}^{+}}} {\A} \stackrel{\text{ dil. }{─────▸} {\NaOH}} \text{ B } \stackrel{∆}{ ──▸} \text{ C } OR Do the following conversions in not more than two steps: (i) Benzoic acid to benzaldehyde (ii) Ethyl benzene to benzoic acid (iii) Propanone to propene

CBSE Class 12 Chemistry 2017 Delhi Set 1 Solved Paper

Question : 18 of 26

Marks: +1, -0

Write structures of compounds

A, B

and

C

in each of the following reaction:
(i)

{\C}_6 {\H}_5 {\Br} \ {─────▸}↖{ {\Mg} \/ \;\text " dry ether "\;} \A \ {─────▸}↙{\;\text " (b) "\; {\H}_3 {\O}^{+}}↖{ (\a) \ \CO_{2(\g)}}

\B \ { ───▸}↖{ {\PCl}_3} {\C}

(ii)

\CH_3\CN \ {─────▸}↖{(\a) {\SnCl}_2 \/ {\HCl}}↙{{\;\text " (b) "\; {\H}_3 {\O}^{+}}} {\A} \ {─────▸}↖{\;\text " dil. "\; {\NaOH}} \;\text " B "\;

\ { ──▸}↖{∆} \;\text " C "\;

OR
Do the following conversions in not more than two steps:
(i) Benzoic acid to benzaldehyde
(ii) Ethyl benzene to benzoic acid
(iii) Propanone to propene

Solution:

(iii)

{ {\CH}_3- {\C}↖{∥}↖{\O}- {\CH}_3}↙{\Propanone} \ {─────▸}↖{ {\LiAlH}_4}

{\CH}_3 {\CH}↖{|}↖{\OH}- {\CH}_3 \ {─────▸}↖{ {\H}_2 {\SO}_4}

{{\CH}_3 {\CH}= {\CH}_2}↙{\Propene}

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