Exams › JEE Main › Chemistry

Which one of the following has an optical isomer? (en = ethylenediamine)

1. [Zn(en)(NH3)2]2+
2. [Co(en)3]3+
3. [Co(H2O)4(en)]3+
4. [Zn(en)2]2+

Correct answer: [Co(en)3]3+

Solution

The complex [Co(en)3]3+ has three bidentate ethylenediamine ligands, creating a chiral environment around the cobalt center, which results in optical isomerism. In contrast, the other options either have a symmetrical arrangement or do not contain enough bidentate ligands to create chirality.

Related JEE Main Chemistry questions

• When sodium hydroxide is introduced into an aqueous Zn2+ solution, a white precipitate forms, and this precipitate dissolves when more NaOH is added. In such a solution, zinc is present in the:
• When excess ammonia is added to a copper sulphate solution, a deep blue colour appears because of the formation of which species?
• In the nitroprusside ion, iron and NO are present as Fe2+ and NO+ instead of Fe3+ and NO. These two formulations can be distinguished by
• In the brown ring test for nitrite and nitrate ions, the characteristic brown ring is produced because a complex ion is formed with which formula?
• What is the spin-only magnetic moment, expressed in Bohr magnetons (μB), for Ni2+ in aqueous solution? (Atomic number of Ni = 28)
• Silver chloride dissolves in aqueous ammonium hydroxide because it leads to the formation of which species?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →