Toluene is treated with CO and HCl in the presence of anhydrous AlCl3 and CuCl (Gatterman-Koch). The major product is

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JEE Main levelSingle correct optionDifficulty 2 of 3co019

Toluene is treated with $CO$ and $HCl$ in the presence of anhydrous $AlCl X_{3}$ and $CuCl$ (Gatterman-Koch). The major product is

A2-methylbenzaldehyde
B4-methylbenzaldehyde
Cphenylacetaldehyde
D1-phenylethan-1-one

Answer: B

The reactive species is the formyl cation

HC X^{+} = O

which substitutes the ring. The methyl group is ortho/para directing and the para product dominates because of steric hindrance, giving 4-methylbenzaldehyde.

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Toluene is treated with CO and HCl in the presence of anhydrous AlClX3​ and CuCl (Gatterman-Koch). The major product is

Answer: B

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Toluene is treated with $CO$ and $HCl$ in the presence of anhydrous $AlCl X_{3}$ and $CuCl$ (Gatterman-Koch). The major product is