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CBSE Class 12 Chemistry 2020 Outside Delhi Set 1 Solved Paper

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Question : 34
Total: 37
Write the product(s) of the following reactions:
OR
(a) Write the mechanism of the following SN1 reaction:
(CH3)3C−Br‌
Aqâ‹…NaOH
──────▸
(CH3)3‌C −OH+NaBr
(b) Write the equation for the preparation of 2-methyl-2-methoxypropane by Williamson synthesis.
Solution:  

OR
(CH3)3C−Br‌
Aqâ‹…NaOH
──────▸
(CH3)3‌C −OH+NaBr
Step-I :
Step-II :

(b) Williamson synthesis:
CH3−
CH3
|
C
|
CH3
−Br+NaOCH3→ CH3−
CH3
|
C
|
CH3
−O−CH3+NaBr
OR
CH3−
CH3
|
C
|
CH3
−ONa+CH3−Br
Sodium−2−methyl−2−propoxide
‌ Heat ‌
────▸
CH3−
CH3
|
C
|
CH3
−OCH3+NaBr
2−methyl−2−methoxy‌propane
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