CBSE Class 12 Chemistry 2020 Delhi Set 1 Solved Paper

Question : 32 of 37

Marks: +1, -0

Give the structures of final products expected from the following reactions :
(i) Hydroboration of propene followed by oxidation with

{\H}_2 {\O}_2

in alkaline medium.
(ii) Dehydration of

( {\CH}_3) _3 {\C}- {\OH}

by heating it with

20 \% {\H}_3 {\PO}_4

358 {\K}

OR
How can you convert the following?
(i) Phenol to

o

-hydroxybenzaldehyde
(ii) Methanal to ethanol
(iii) Phenol to phenyl ethanoate

Solution:

(i)

(ii)

{\CH_3-\C↖{|}↖{\CH_3}↙{|}↙{\CH_3}-\OH}↙{t-\butyl \alcohol (2 \methyl-2-\propanol)} {────▸}↖{20 \% {\H}_3 {\PO}_4}↙{358\K}

{\CH_3-\C↙{|}↙{\CH_3}=\CH_2+\H_2\O}↙{2 \methylpropene (\Isobutylene)}

(iii)

{\C}_6 {\H}_5 {\OH}+{ ( {\CH}_3 {\CO}) _2 {\O} }↙{\Acetic \anhydride}→

{{\CH}_3 {\COOC}_6 {\H}_5}↙{\Phenylethanoate}+ {\CH}_3 {\COOH}

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