JEE Advanced Chemistry question

Of the following complex ions, one exhibits optical isomerism, That one is

(A)cis-[Co(en)_2Cl_2]^+Correct
(B)
(C)
(D)trans-[Co(en)_2Cl_2]^+

Answer: (A)

Solution

cis-[Co(en)_2Cl_2]^+ lacks any plane or centre of symmetry (the two chelate rings are twisted non-symmetrically around the two cis chlorides), so it is chiral and exists as non-superimposable mirror-image forms —

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Question ID VK-160045