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Question

Chemistry Question on Phenols

Reaction of propene with diborane followed alkaline hydrolysis in the presence of hydrogen peroxide gives

A

1-propanol

B

2-propanol

C

1, 2-dihydroxypropane

D

n-propane

Answer

1-propanol

Explanation

Solution

CH3CH=CH2+(HBH2)2CH3CH2CH2BH2CH3CH=CH2CH _{3}- CH = CH _{2}+\left( H - BH _{2}\right)_{2} \rightarrow CH _{3}- CH _{2}- CH _{2} BH _{2} \xrightarrow{CH_3CH =CH_2}
(CH3CH2CH2)2BHCH3CH=CH2\left( CH _{3}- CH _{2}- CH _{2}\right)_{2} BH \xrightarrow{ CH _{3} CH = CH _{2}}
(CH3CH2CH2)3BOHH2O,3H2O2\left( CH _{3} CH _{2} CH _{2}\right)_{3} B \xrightarrow[OH^-]{ H _{2} O , 3 H _{2} O _{2}}
3CH3CH2CH2OH propan-1-ol +B(OH)3\underset{\text { propan-1-ol }}{3 CH _{3} CH _{2} CH _{2} OH }+ B ( OH )_{3}