It is a sequence of reactions where heptane is oxidised to methyl benzene, further oxidised to benzaldehyde, and finally cannizzaro reaction occurs to give the desired product.

JEE Main 2023 — Chemistry Organic Chemistry

The correct sequence of reagents for the preparation of Q and R is:
Held on 25 Jan 2023 · Verified 6 Jul 2026.
(i) Cr2O3,770K,20atm; (ii) CrO2Cl2,H3O+; (iii) NaOH; (iv) H3O+
(i) CrO2Cl2,H3O+; (ii) Cr2O3,770K,20atm; (iii) NaOH; (iv) H3O+
(i) KMnO4,OH−; (ii) Mo2O3,Δ; (iii) NaOH; (iv) H3O+
(i) Mo2O3,Δ; (ii) CrO2Cl2,H3O+; (iii) NaOH; (iv) H3O+
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A hydroxy compound $(\mathrm{X})$ with molar mass $122 \mathrm{~g} \mathrm{~mol}^{-1}$ is acetylated with acetic anhydride, using a large excess of the reagent ensuring complete acetylation of all hydroxyl groups. The product obtained has a molar mass of $290 \mathrm{~g} \mathrm{~mol}^{-1}$. The number of hydroxyl groups present in compound (X) is:
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