2-bromopentane is heated with potassium hydroxide in ethanol. The major product obtained is

Question

2-bromopentane is heated with potassium hydroxide in ethanol. The major product obtained is (A) Pentene-1 (B) cis pentene-2 (C) trans pentene-2 (D) 2 -ethoxypentane

Tardigrade Admin · Accepted Answer

When alkyl halide reacts with ale. KOH then it favours elimination reaction (Dehydrohalogenation). Since, trans pentene-2 is more symmetrical than cis isomers. Hence, it is main product.

Q. 2-bromopentane is heated with potassium hydroxide in ethanol. The major product obtained is

Pentene-1

cis pentene-2

trans pentene-2

2 -ethoxypentane

When alkyl halide reacts with ale. KOH then it favours elimination reaction (Dehydrohalogenation). Since, trans pentene-2 is more symmetrical than cis isomers. Hence, it is main product.