Question

1 multiple choice 2 points which of the following is a vicinal dihalide? cis - 1,2 - dibromocyclopentane 3,3 - dichloropentane 1,3 - dibromoheptane isobutyl chloride trans - 1,4 - diiodocyclohexane

Explanation:

Step1: Define vicinal dihalide

A vicinal dihalide has halogen atoms on adjacent carbon atoms.

Step2: Analyze each option

• cis - 1,2 - dibromocyclopentane: Bromine atoms are on adjacent (1 and 2) carbon atoms of the cyclopentane ring.
• 3,3 - dichloropentane: Chlorine atoms are on the same (3rd) carbon atom.
• 1,3 - dibromoheptane: Bromine atoms are on non - adjacent (1 and 3) carbon atoms.
• isobutyl chloride: Only one chlorine atom, not a dihalide.
• trans - 1,4 - diiodocyclohexane: Iodine atoms are on non - adjacent (1 and 4) carbon atoms.

Answer:

cis - 1,2 - dibromocyclopentane