Question

Which of the following compounds gives a secondary alcohol upon reaction with methylmagnesium bromide?

विकल्प

• Butyl formate

• 3-Pentanone

• Pentanal

• Methyl butanoate

Answer 1

Pentanal

Explanation:

$$\begin{array}{c}\phantom{......................}\mathrm{O}\phantom{...............................}\mathrm{OMgBr}\phantom{.......................}\mathrm{OH}\phantom{......}\\ \phantom{...............}||\phantom{................................}|\phantom{..............................}|\phantom{.}\\ \phantom{}\mathrm{CH}{\phantom{A}}_3\mathrm{CH}{\phantom{A}}_2\mathrm{CH}{\phantom{A}}_2\mathrm{CH}{\phantom{A}}_2-\mathrm{C}-\mathrm{H}\stackrel{\mathrm{RMgBr}}{\to }\mathrm{CH}{\phantom{A}}_3\mathrm{CH}{\phantom{A}}_2\mathrm{CH}{\phantom{A}}_2\mathrm{CH}{\phantom{A}}_2-\mathrm{C}-\mathrm{H}\stackrel{\mathrm{H}{\phantom{A}}_2\mathrm{O}}{\to }\mathrm{CH}{\phantom{A}}_3\mathrm{CH}{\phantom{A}}_2\mathrm{CH}{\phantom{A}}_2\mathrm{CH}{\phantom{A}}_2-\mathrm{C}-\mathrm{H}\phantom{}\\ \phantom{.................................................}|\phantom{..............................}|\phantom{..}\\ \phantom{..................................................}\mathrm{R}\phantom{.............................}\mathrm{R}\phantom{..}\end{array}$$