Question

What would be the reactant and reagent used to obtain 2, 4-dimethyl pentan-3-ol?

Options

• Propanal and propyl magnesium bromide

• 3-methylbutanal and 2-methyl magnesium

• 2-dimethylpropanone and methyl magnesium iodide

• 2- methylpropanal and isopropyl magnesium iodide

Answer 1

2- methylpropanal and isopropyl magnesium iodide

Explanation:

\[\begin{array}{cc}
\phantom{.............}\ce{H}\phantom{.............................................}\ce{H}\phantom{...........................}\ce{H}\phantom{.......}\\
\phantom{.............}|\phantom{..............................................}|\phantom{............................}|\phantom{.......}\\
\ce{CH3 - CH - C = O + \underset{isopropyl magnesium iodide}{(CH3)2CHMgI} -> (CH3)2CH - C - OMgI ->[H2O] (CH3)2CH - C - OH}\\
\phantom{.............}|\phantom{..............................................}|\phantom{............................}|\phantom{.......}\\
\phantom{.......................}\ce{\underset{2-Methylpropanal}{CH3}}\phantom{......................................}\ce{CH(CH3)2}\phantom{...............}\ce{\underset{2, 4-Dimethylpentane-3-ol}{CH(CH3)2}}\phantom{........}
\end{array}\]