Which of the following is an example of vic-dihalide?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 1,2-Dichloroethane
1,2-Dichloroethane, \( \ce{ClCH2-CH2Cl} \), has one chlorine on C-1 and one on the adjacent carbon C-2, so it is a vic-dihalide (common name ethylene dichloride).
Why the other options are incorrect
Option (1) Dichloromethane — Incorrect. \( \ce{CH2Cl2} \) has one carbon carrying both chlorines: a gem-dihalide (methylene chloride).
Option (3) Ethylidene chloride — Incorrect. \( \ce{CH3-CHCl2} \) has both chlorines on the same carbon: a gem-dihalide (alkylidene halide).
Option (4) Allyl Chloride — Incorrect. \( \ce{CH2=CH-CH2Cl} \) has only one halogen; it is an allylic halide, not a dihalide.
NCERT (2026-27 edition):
Nomenclature – …
