JEE Main 2026 — Jan 28, Shift 2 — Chemistry solution

JEE Main2026Jan 28, Shift 2Chemistry

The reactions which produce alcohol as the product area :

A. $CH_{4} + O_{2} Mo_{2} O_{3}, Δ$

B. $2 CH_{3} CH_{3} + 3 O_{2} (CH_{3} COO)_{2} Mn, Δ$

C. $(CH_{3})_{3} CH KMnO_{4}$

D. $2 CH_{4} + O_{2} Cu /523 K /100 atm$

E. $CH_{3} - CH = CH - CH_{3} KMnO_{4} / H^{+}$

Choose the correct answer from the options given below :

Solution

Identify the major product of each:

A. CH $_{4}$ + O $_{2}$ over Mo $_{2}$ O $_{3}$ catalyst gives HCHO (formaldehyde), not an alcohol.

B. Manganese-acetate catalysed oxidation of ethane gives CH $_{3}$ COOH (acetic acid).

C. Tertiary C-H of isobutane $(CH_{3})_{3} CH$ is selectively oxidised by KMnO $_{4}$ to tert-butyl alcohol $(CH_{3})_{3} COH$ — alcohol.

D. CH $_{4}$ + O $_{2}$ over Cu at 523 K and 100 atm gives CH $_{3}$ OH (methanol) — alcohol.

E. Hot acidic KMnO $_{4}$ cleaves the alkene to give two equivalents of acetic acid.

$∴$ Only C and D give alcohol.

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