NEET2026ChemistryChapterActual
Identify the major products A and B formed in the following reaction sequence.
Options
- AA = 3-Chloro-2-methylpentane ; B = 2-Methylpent-2-ene
- BA = 2-Chloro-3-methylpentane ; B = 3-Methylpent-2-ene
- CA = 3-Chloro-2-methylpentane ; B = 4-Methylpent-2-ene
- DA = 2-Chloro-2-methylpentane ; B = 2-Methylpent-2-ene
Correct answer
A. A = 3-Chloro-2-methylpentane ; B = 2-Methylpent-2-ene
Step-by-step solution
The given starting material is 2-methylpentan-3-ol, with the structure CH ₃- CH ₂- CH(OH) - CH(CH ₃)₂ . Reaction with SOCl ₂ Thionyl chloride ( SOCl ₂ ) converts alcohols into alkyl chlorides. This reaction proceeds without the formation of a free carbocation, meaning no rearrangement takes place. The - OH group is directly replaced by a - Cl atom. Product A is CH ₃- CH ₂- CH(Cl) - CH(CH ₃)₂ , which is named 3-chloro-2-methylpentane. Reaction with alc. KOH , Alcoholic KOH with heat brings about dehydrohalogenation