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Chemistry Question on coordination compounds

Which one of the following has an optical isomer ? (en = ethylenediamine)

A

[Zn(en)(NH3)2]2+\left[Zn\left(en\right)\left(NH_{3}\right)_{2}\right]^{2+}

B

[Co(en)3]3+\left[Co\left(en\right)_{3}\right]^{3+}

C

[Co(H2O)4(en)]3+\left[Co\left(H_{2}O\right)_{4}\left(en\right)\right]^{3+}

D

[Zn(en)2]2+\left[Zn\left(en\right)_{2}\right]^{2+}

Answer

[Co(en)3]3+\left[Co\left(en\right)_{3}\right]^{3+}

Explanation

Solution

Only option (2) is having non-super imposable mirror image & hence one optical isomer.