Question

Number of isomeric forms (constitutional and stereoisomers) for $[Rh(en)_{2}(NO_{2})\,(SCN)^{+}$ are

• A. three
• B. six
• C. nine
• D. twelve

Answer 1

Answer: (D)

twelve

Answer 2

Ambidentate ligands $NO_{2}$ and SCN will give four different cis isomers and each isomer has two optically active $d$-and $l$ -forms. cis--fonn cis- $(l)$ -form cis--form cis- $(l)$ -form cis--form cis- $(l)$ -form $NO_{2}$ and SCN also give four optically inactive trans isomers. optically inactive trans (meso) -forms optically inactive trans (meso)-forms