Chemistry - Hydrocarbon Question with Solution | TestHub

Alkene CH₂=CH–CH₃ (propene) reacts with NBS/CCl₄, Δ → allylic bromination occurs (not addition).

Bromine substitutes at allylic position forming allyl bromide (CH₂=CH–CH₂Br) with resonance-stabilized radical.

This allyl bromide shows resonance → structure can shift double bond position.

Now treatment with Na/dry ether (Wurtz reaction) causes coupling of two allyl radicals.

Due to resonance, different coupling modes are possible → giving multiple products.

Products formed include conjugated and cumulated dienes depending on bonding positions.

Hence, structures corresponding to A, C, and D are possible.

Option B is not formed because it doesn’t match resonance-assisted coupling pattern.