JEE Main 2016 Chemistry question

Which one of the following complexes shows optical isomerism? (en=ethylendiamine)

(1)trans
(2)
(3)
(4)cis Correct

Answer: (4)

Solution

Optical isomerism requires the complex ion to be chiral, that is, to possess no plane or centre of symmetry. For octahedral complexes of the type with a bidentate chelate, only the **cis** form is chiral: the two chelate rings and the two chlorides are arranged like a propeller,

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Question ID VK-115456