First slide

Stereo isomerism

Question

Which of the following complex will show optical activity?

Moderate

A

$trans - {[Co {({NH}_{3})}_{4} {Cl}_{2}]}^{+}$
B

${[Cr {(H_{2} O)}_{6}]}^{3 +}$
C

$cis - {[Co {({NH}_{3})}_{2} {(en)}_{2}]}^{3 +}$
D

$trans - {[Co {({NH}_{3})}_{2} {(en)}_{2}]}^{3 +}$

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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