JEE Main 2022 · 26 Jun · Shift 2 · Chemistry Q72

← JEE Main 2022 · 26 Jun · Shift 2

ChemistrySingle correct+4 / -1Question 72 of 90

Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?

\mathrm{CrO_3}

/acetic acid,

\mathrm{H_3O^+}

\mathrm{CrO_3}

/acetic anhydride,

\mathrm{H_3O^+}

\mathrm{KMnO_4}

/HCl,

\mathrm{H_3O^+}

CO/HCl, anhydrous

\mathrm{AlCl_3}

Answer and worked solution

Official answer: B

$\mathrm{CrO_3}$ in acetic anhydride turns the methyl group into a benzylidene diacetate, which stops further oxidation; acid hydrolysis gives benzaldehyde.

(B)

Topics:Named reactions Oxidation and reduction

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JEE Main 2022 · 26 Jun · Shift 2, Chemistry question 72