CBSE Class 12 Chemistry 2020 Delhi Set 1 Solved Paper

Question : 32

Total: 37

Give the structures of final products expected from the following reactions :
(i) Hydroboration of propene followed by oxidation with H2O2 in alkaline medium.
(ii) Dehydration of (CH3)3C−OH by heating it with 20%H3PO4 at 358K.

OR
How can you convert the following?
(i) Phenol to o-hydroxybenzaldehyde
(ii) Methanal to ethanol
(iii) Phenol to phenyl ethanoate

Solution:

(i)

(ii)

CH3−

CH3

−OH

t−butyl‌alcohol(2‌methyl−2−propanol)

20%H3PO4

────▸

358K

CH3−

CH3

=CH2+H2O

2‌methylpropene(Isobutylene)

(iii) C6H5‌OH+

(CH3‌CO)2O

Acetic‌anhydride

→

CH3COOC6H5

Phenylethanoate

+CH3‌COOH

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