A) \[{{C}_{6}}{{H}_{5}}-CO-C{{H}_{2}}Br\]
B) \[{{C}_{6}}{{H}_{5}}-\underset{\begin{smallmatrix} | \\ Br \end{smallmatrix}}{\mathop{C}}\,H-C{{H}_{3}}\]
C) \[{{C}_{6}}{{H}_{5}}-C{{(C{{H}_{3}})}_{2}}-Br\]
D) \[{{C}_{6}}{{H}_{5}}-\underset{\begin{smallmatrix} | \\ Br \end{smallmatrix}}{\mathop{C}}\,H-{{C}_{6}}{{H}_{5}}\]
Correct Answer: C
Solution :
Dimethylsulphoxide (DMSO) reacts with \[1{}^\circ \] alkyl halide to give aldehyde and \[2{}^\circ \] alkyl halide to give ketone. It does not react with \[3{}^\circ \] alkyl halide because the carbon containing halogen does not have hydrogen.
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