CBSE Class 12 Chemistry 2020 Outside Delhi Set 1 Solved Paper

Question : 32

Total: 37

(i) Write the structure of major alkene formed by β-elimination of 2, 2, 3-trimethyl-3bromopentane with sodium ethoxide in ethanol.
(ii) Which one of the compounds in the following pairs is chiral?

(iii) Identify (A) and (B) in the following:

OR
How can you convert the following?
(i) But-1-ene to 1-iodobutane
(ii) Benzene to acetophenone
(iii) Ethanol to propanenitrile

Solution:

(i) CH3−

CH3

−

CH3

−CH2−CH3

C2H5‌ONa∕C2H5‌OH

──────────▸

−HBr

CH3−

CH3

−

CH3

=CH−CH3

3,4,4−Trimethylpent−2−ene(major)

CH3−

CH3

−

CH2

∥

−CH2−CH3

2−ethyl−3,3−dimethylbut−1−ene

(iii) C2H5‌OH‌

RedP∕Br2

────▸

‌CH3−CH2−Br‌

KCN

────▸

‌ Aq. ethanol ‌

CH3CH2‌CN

‌ Propanenitrile ‌

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