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Question
How will you bring about the following conversion?
Bromomethane to propanone
Solution
\[\begin{array}{cc}
\ce{\underset{Bromomethane}{CH3 - Br} ->[Alc. KCN][C2H5OH, -H2O, \Delta] \underset{Acetonitrile}{CH3CN} ->[CH3MgBr/ether] [CH3 - C = NMgBr] ->[H^+/H2O][-NH3, -Mg(OH)Br] CH3 - C = O}\\
\phantom{.....................................................}|\phantom{....................................}|\phantom{.}\\
\phantom{..........................................................}\ce{CH3}\phantom{...............................}\ce{\underset{propanone}{CH3}}\phantom{..}
\end{array}\]
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