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Which of the following compounds show optical isomerism?
\( P \)
I. cis- \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+} \)
II. trans \( \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+} \)
W
III. \( c i s-\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+} \)
IV. \( \left[\operatorname{Co}(\mathrm{en})_{3}\right]^{3+} \)
Choose the correct answer from the codes given below.
(Kerala CEE 2014)
(a) I and II
(b) II and III
(c) III and IV
(d) I, III and IV
(e) I, II, III and IV
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