JEE Main 2016 · 3 Apr · Shift 1 · Chemistry Q49

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ChemistrySingle correct+4 / -1Question 49 of 90

Which one of the following complexes shows optical isomerism ?

(en = ethylenediamine)

\ce{[Co(NH3)3Cl3]}

cis

\ce{[Co(en)2Cl2]Cl}

trans

\ce{[Co(en)2Cl2]Cl}

\ce{[Co(NH3)4Cl2]Cl}

Answer and worked solution

Official answer: B

cis- $\ce{[Co(en)2Cl2]+}$ has no mirror plane: its two mirror images are not superimposable. The trans isomer has a mirror plane, and the ammine complexes have no chelate rings to make them chiral.

Topics:Isomerism in complexes

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JEE Main 2016 · 3 Apr · Shift 1, Chemistry question 49