Test Index

CBSE Class 12 Chemistry 2020 Outside Delhi Set 1 Solved Paper

© examsnet.com
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
|
C
|
CH3
−
Br
|
C
|
CH3
−CH2−CH3
C2H5‌ONa∕C2H5‌OH
──────────▸
−HBr
CH3−
CH3
|
C
|
CH3
−
C
|
CH3
=CH−CH3
3,4,4−Trimethylpent−2−ene(major)
 +
CH3−
CH3
|
C
|
CH3
−
CH2
∥
C
−CH2−CH3
2−ethyl−3,3−dimethylbut−1−ene
OR
(iii) C2H5‌OH‌
RedP∕Br2
────▸
‌CH3−CH2−Br‌
KCN
────▸
‌ Aq. ethanol ‌
CH3CH2‌CN
‌ Propanenitrile ‌
© examsnet.com
Go to Question:
Prev Question
Next Question