Question

Which of the following reactions yields propan-2-ol?

विकल्प

• \[\ce{H - CHO ->[C2H5MgBr/ether][H3O^+]}\]

• \[\ce{CH3 - CH = CH2 ->[(i) B2H6][(ii) H2O2]}\]

• \[\ce{CH3 - CH = CH2 ->[(i) cold, conc. H2SO4][(ii) H2O]}\]

• \[\ce{CH3 - CO - CH3 ->[CH3MgI/ether][H3O^+]}\]

Answer 1

\[\ce{CH3 - CH = CH2 ->[(i) cold, conc. H2SO4][(ii) H2O]}\]

Explanation:

1. \[\ce{\underset{Formaldehyde}{H - CHO} ->[C2H5MgBr/ether][H3O^+] \underset{Propan-1-ol}{CH3 - CH2 - CH2 - OH}}\]

2. \[\ce{\underset{Propene}{CH3 - CH = CH2} ->[(i) B2H6][(ii) H2O2] \underset{Propan-1-ol}{CH3 - CH2 - CH2 - OH}}\]

3. \[\begin{array}{cc}
\ce{\underset{Propene}{CH3 - CH = CH2} ->[(i) cold, conc. H2SO4][(ii) H2O] CH3 - CH - CH3}\\
\phantom{..................................}|\\
\phantom{....................................}\ce{\underset{Propan-2-ol}{OH}}
\end{array}\]

4. \[\begin{array}{cc}
\phantom{................................}\ce{OH}\\
\phantom{..............................}|\\
\ce{\underset{Acetone}{CH3 - CO - CH3} ->[CH3MgI/ether][H3O^+] CH3 - C - CH3}\\
\phantom{..............................}|\\
\phantom{.................................}\ce{\underset{2-Methylpropan-2-ol}{CH3}}
\end{array}\]