Write the product(s) of the following reactions: OR (a) Write the mechanism of the following {\S}_{ {\N}} 1 reaction: ( {\CH}_3) _3 {\C}- {\Br} {{──────▸} }^{ {\Aq} \cdot {\NaOH}} ( {\CH}_3) _3 {\C} - {\OH}+ {\NaBr} (b) Write the equation for the preparation of 2-methyl-2-methoxypropane by Williamson synthesis.

CBSE Class 12 Chemistry 2020 Outside Delhi Set 1 Solved Paper

Question : 34 of 37

Marks: +1, -0

Write the product(s) of the following reactions:

OR
(a) Write the mechanism of the following

{\S}_{ {\N}} 1

reaction:

( {\CH}_3) _3 {\C}- {\Br} {{──────▸} }↖{ {\Aq} ⋅ {\NaOH}} ( {\CH}_3) _3 {\C}

- {\OH}+ {\NaBr}

(b) Write the equation for the preparation of 2-methyl-2-methoxypropane by Williamson synthesis.

Solution:

( {\CH}_3) _3 {\C}- {\Br} {{──────▸} }↖{ {\Aq} ⋅ {\NaOH}} ( {\CH}_3) _3 {\C}

- {\OH}+ {\NaBr}

Step-I :

Step-II :

(b) Williamson synthesis:

{\CH}_3- {\C}↖{|}↖{ {\CH}_3}↙{|}↙{ {\CH}_3}- {\Br}+ {\NaOCH}_3 →

{\CH}_3- {\C}↖{|}↖{ {\CH}_3}↙{|}↙{ {\CH}_3}- {\O}- {\CH}_3+ {\NaBr}

{ {\CH}_3- {\C}↖{|}↖{ {\CH}_3}↙{|}↙{ {\CH}_3}- {\ONa}+ {\CH}_3- {\Br} }↙{\Sodium-2-\methyl-2-\propoxide} {{────▸} }↖{\;\text " Heat "\;}

{{\CH}_3- {\C}↖{|}↖{ {\CH}_3}↙{|}↙{ {\CH}_3}- {\OCH}_3+ {\NaBr}}↙{2-\methyl-2-\methoxy \propane}

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