How do you convert: (i) Chlorobenzene to biphenyl, (ii) ...

CBSE Class 12 Chemistry 2016 Outside Delhi Set 1 Solved Paper

Question : 19 of 26

Marks: +1, -0

How do you convert:
(i) Chlorobenzene to biphenyl,
(ii) Propene to 1-iodopropane,
(iii) 2-bromobutane to but-2-ene.
OR
Write the major product (s) in the following:
(i)

(ii)

2 {\CH}_3- {\CH}↙{|}↙{\Cl}- {\CH}_3 \ {─────▸}↖{\Na}↙{\;\text " dry ether "\;}

?
(iii)

{\CH}_3- {\CH}_2- {\Br} \ {─────▸}↖{ {\AgCN}}

Solution:

(i)

(ii)

{\CH}_3 {\CH}= {\CH}_2  \ {─────▸}↖{ {\HBr} \/ \;\text " peroxide "\;}

{\CH}_3 {\CH}_2 {\CH}_2 {\Br}  \ {─────▸}↖{\;\text " Nal / acetone "\;}

{\CH}_3 {\CH}_2 {\CH}_2 {\I}

(iii)

{\CH}_3 {\CH}_2 {{\CH}↙{|}↙{\Br}\CH_3}  \ {─────▸}↖{\;\text " Alc.KOH "\;}

{\CH}_3 {\CH}= {\CH\CH}_3

OR(i)

(ii)

{\CH}_3- {\CH}↖{|}↖{\CH_3}- {\CH}↖{|}↖{\CH_3}- {\CH}_3

(iii)

{\CH}_3 {\CH}_2 {\NC}

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