Hydrocarbons — JEE Main 2026 · 21 Jan, Morning shift · Q55

Question

Identify A in the following reaction. A on treatment with 2H₂/Pt gives decalin (bicyclo[4.4.0]decane), while A on treatment with KMnO₄/Δ gives cyclohexane-1,2-dicarboxylic acid + oxalic acid (HOOC-COOH).

Accepted Answer

(C) hexahydronaphthalene with both C=C (a conjugated diene) in the right ring, the left ring and ring-fusion carbons saturated

Answer

(A) hexahydronaphthalene with one C=C in each ring: on the upper-left edge of the left ring and on the right edge of the right ring; ring-fusion carbons saturated

Answer

(B) hexahydronaphthalene with one C=C in each ring: on the left edge of the left ring and on the right edge of the right ring; ring-fusion carbons saturated

Answer

(D) hexahydronaphthalene with one C=C at the ring fusion and one C=C in the left ring, the right ring otherwise saturated

Hydrocarbons: JEE Main 2026 Chemistry question

More on Hydrocarbons

Hydrocarbons: JEE Main 2026 Chemistry question

More on Hydrocarbons