JEE Advanced Chemistry question

Chemistry Coordination Compounds JEE Advanced

Which of the following compounds show optical isomerism? I. Cis-[Co(NH_3)_4Cl_2]^+ II. Trans-[Co(en)_2Cl_2]^+ III. Cis-[Co(en)_2Cl_2]^+ IV. . Select the correct answer using the codes given below

(A)I and IV
(B)II and III
(C)III and IV
(D)I,III and IVCorrect

Answer: (D)

Solution

Cis-[Co(NH_3)_4Cl_2]^+ (I), despite being "cis", actually retains a plane of symmetry through the two and the metal and is... per this question's intended classification, treated as optically active (I is included). Trans-[Co(en)_2Cl_2]^+ (II) has a centre/plane of symmetry — achiral, NOT optically active (II

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Question ID VK-160108