Which one of the following compounds is optically active? (1) (2) (3) (4) · ABC26OR0909
Subject: Organic Chemistry · Chapter: Stereochemistry · Topic: Stereochemistry – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Easy
Which one of the following compounds is optically active? 
(1) 
(2) 
(3) 
(4)
(1) (2) (3) (4)(a)1
(b)2
(c)3
(d)4
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
cis-1,3-Dichlorocyclobutane (1), trans-1,3-dichlorocyclobutane (2) and cis-1,3-dichlorocyclopentane (3) all have mirror planes; only trans-1,3-dichlorocyclopentane (4) is chiral (C₂-symmetric) and optically active.
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