Question

Which of the following complexes is optically active?

• A. $[Co(NH_{3})_{5}Cl]^{+}$
• B. $[Co(NH_{3})Cl_{5}]^{3-}$
• C. $cis-[Co(en)_{2} Cl_{2} ]$
• D. $trans- [Co(en)_{2}Cl_{2}]$

Answer 1

Answer: (C)

$cis-[Co(en)_{2} Cl_{2} ]$

Answer 2

$cis [Co(en)_{2} Cl_{2}]$ does not have a plane of symmetry hence, it is a chiral molecule and optically active