Question

Which of the following complex exists as pair of enantiomers?

• A. $\lbrack Co(NH_{3})_{4}Cl_{2}\rbrack^{+}$
• B. $\lbrack Cr(en)_{3}\rbrack^{3 +}$
• C. $\lbrack Co(P(C_{2}H_{5})_{3})_{2}ClBr\rbrack$
• D. Trans - $\lbrack Co(en)_{2}Cl_{2}\rbrack^{+}$

Answer 1

Answer: (B)

$\lbrack Cr(en)_{3}\rbrack^{3 +}$

Answer 2

Optical isomerism is common in octahedral complexes of the formula $\lbrack Ma_{2}b_{2}c_{2}\rbrack,\lbrack M(AA)_{3}\rbrack$ etc.

$\lbrack Cr(en)_{3}\rbrack^{3 +}$shows optical isomerism and exists as a pair of enantiomers.