question_answer

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

A)  three

B)  six

C)  nine             

D)  twelve

Correct Answer: D

Solution :

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