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JEE Main levelOne or more correct optionsDifficulty 2 of 3co045

Which of the following sets of reactants give an aldehyde as the main product after the usual work-up?

Atoluene, $CrO X_{2} Cl X_{2}$ in $CS X_{2}$ , then $H X_{3} O X^{+}$
B $C X_{6} H X_{5} COCl$ , $H X_{2}$ , $Pd$ - $BaSO X_{4}$
Cpropanenitrile, $SnCl X_{2}$ / $HCl$ , then $H X_{2} O$
Dethyl benzoate, excess $LiAlH X_{4}$ , then $H X_{2} O$

Answer: A, B, C

Rosenmund reduction gives

C X_{6} H X_{5} CHO

, the Etard reaction gives

C X_{6} H X_{5} CHO

and the Stephen reaction gives

CH X_{3} CH X_{2} CHO

. Excess

LiAlH X_{4}

reduces the ester completely to benzyl alcohol.

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