Question

Number of isomeric forms (constitutional and stereoisomers) for $[Rh(en{)}_2(N{O}_2)(SCN{)}^{+}$ are

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

Answer 1

Answer: (D)

Ambidentate ligands $N{O}_2$ 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
$N{O}_2$ and SCN also give four optically inactive trans isomers.
optically inactive trans (meso) -forms
optically inactive trans (meso)-forms