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CBSE Class 12 Chemistry 2020 Delhi Set 1 Solved Paper

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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 H2O2\mathrm{H}_2\mathrm{O}_2 in alkaline medium.
(ii) Dehydration of (CH3)3C−OH(\mathrm{CH}_3)_3\mathrm{C}-\mathrm{OH} by heating it with 20% H3PO420\%\ \mathrm{H}_3\mathrm{PO}_4 at 358 K358\ \mathrm{K}.
OR
How can you convert the following?
(i) Phenol to oo-hydroxybenzaldehyde
(ii) Methanal to ethanol
(iii) Phenol to phenyl ethanoate
Solution:  
(i)
(ii) CH3−C∣CH3∣CH3−OHt-butyl alcohol (2 methyl-2-propanol)→358 K20% H3PO4\underset{\text{t-butyl alcohol (2 methyl-2-propanol)}}{\mathrm{CH}_3-\overset{\mathrm{CH}_3}{\overset{\vert}{\mathrm{C}}}\underset{\mathrm{CH}_3}{\vert}-\mathrm{OH}} \xrightarrow[358\ \mathrm{K}]{20\%\ \mathrm{H}_3\mathrm{PO}_4} CH3−C∣CH3=CH2+H2O2 methylpropene (Isobutylene)\underset{\text{2 methylpropene (Isobutylene)}}{\mathrm{CH}_3-\underset{\mathrm{CH}_3}{\underset{\vert}{\mathrm{C}}}=\mathrm{CH}_2+\mathrm{H}_2\mathrm{O}}
(iii) C6H5OH+(CH3CO)2OAcetic anhydride→\mathrm{C}_6\mathrm{H}_5\mathrm{OH} + \underset{\text{Acetic anhydride}}{(\mathrm{CH}_3\mathrm{CO})_2\mathrm{O}} \rightarrow CH3COOC6H5Phenylethanoate+CH3COOH\underset{\text{Phenylethanoate}}{\mathrm{CH}_3\mathrm{COOC}_6\mathrm{H}_5} + \mathrm{CH}_3\mathrm{COOH}
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