Hydrocarbons — JEE Main 2026 · 23 Jan, Evening shift · Q66

Question

A cyclopentane bearing Br on two adjacent ring carbons, with an ethyl group on the ring carbon next to one C–Br and a methyl group on the ring carbon next to the other C–Br (i.e. 1,2-dibromo-3-ethyl-5-methylcyclopentane), is treated with (i) Zn, Δ (ii) HBr to give (P), the major product. Identify (P)

Accepted Answer

(A) 1-bromo-3-ethyl-1-methylcyclopentane (Br on the methyl-bearing carbon)

Answer

(B) 1-bromo-1-ethyl-3-methylcyclopentane (Br on the ethyl-bearing carbon)

Answer

(C) 1-bromo-2-ethyl-4-methylcyclopentane (Br on a ring CH next to the ethyl-bearing carbon, on the side away from the methyl-bearing carbon)

Answer

(D) 1-bromo-2-ethyl-5-methylcyclopentane (Br on the ring CH between the ethyl- and methyl-bearing carbons)

Hydrocarbons: JEE Main 2026 Chemistry question

More on Hydrocarbons

Hydrocarbons: JEE Main 2026 Chemistry question

More on Hydrocarbons