Q.

Which of the following complex will show optical activity?

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a

trans−CoNH34Cl2+

b

CrH2O63+

c

cis−CoNH32en23+

d

trans−CoNH32en23+

answer is C.

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Detailed Solution

(a) trans-[Co(NH3)4Cl2]+ has plane of symmetry as well as centre of symmetry. Hence it does nut show optical isomerism.(b) [Cr(H2O)6]3+ has plane of symmetry as well as centre of symmetry. Hence it does not show optical isomerism.(c) cis-[Co(NH3)2(en)2]3+ lacks symmetry elements.(d) trans-[Co(NH3)2(en)2]3+ has plane of symmetry as well as centre of symmetry. Hence it does not show optical isomerism.
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