array r CH_3-CH_2-CH=CH_2 X CH_3 CH_2-CH_2-CH_2 OH array What is suitable reagent (X) ?

Correct answer: B. B_2 H_6|THF, H_2 O_2| OH^ - The suitable reagent x for the conversion, Butene CH_3 CH_2 CH =CH_2 X Butanol CH_3 CH_2 CH_2 CH_2 OH is B_2 H_6|THF, H_2 O_2| OH . Alkenes react with diborane (B_2 H_6) in presence of THF or diglyme to form alkyl borane (by hydroboration) which on oxidation gives alcohol. The reaction is known as hydroboration-oxidation reaction.

JIPMER 2019

Exam: JIPMER
Year: 2019
Subject: Chemistry
Chapter: Alcohols Phenols and Ethers

JIPMER 2019 · Chemistry · Alcohols Phenols and Ethers

array r CH_3-CH_2-CH=CH_2 X CH_3 CH_2-CH_2-CH_2 OH array What is...

\begin{array}{r}\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}=\mathrm{CH}_2 \xrightarrow{\mathrm{X}} \\ \mathrm{CH}_3 \mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2 \mathrm{OH}\end{array}

What is suitable reagent

(\mathrm{X})

Options

A $\mathrm{H}_2 \mid \mathrm{Pt}$
B $\mathrm{B}_2 \mathrm{H}_6\left|\mathrm{THF}, \mathrm{H}_2 \mathrm{O}_2\right| \mathrm{OH}^{-}$
C $\mathrm{Br}_2 \mid \mathrm{HCl}$
D $\mathrm{HBr} \mid \mathrm{H}_2 \mathrm{O}_2$

Correct answer

B. $\mathrm{B}_2 \mathrm{H}_6\left|\mathrm{THF}, \mathrm{H}_2 \mathrm{O}_2\right| \mathrm{OH}^{-}$

Step-by-step solution

The suitable reagent x for the conversion,

\underset{\text{ Butene }}{\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}}=\mathrm{CH}_2 \xrightarrow{\mathrm{X}} \underset{\text{ Butanol }}{\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OH}}

\mathrm{B}_2 \mathrm{H}_6\left|\mathrm{THF}, \mathrm{H}_2 \mathrm{O}_2\right| \mathrm{OH}

. Alkenes react with diborane

\left(\mathrm{B}_2 \mathrm{H}_6\right)

in presence of THF or diglyme to form alkyl borane (by hydroboration) which on oxidation gives alcohol. The reaction is known as hydroboration-oxidation reaction.

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