Question

Assertion: The $ [Ni{{(en)}_{3}}C{{l}_{2}}]C{{l}_{2}} $ (en= ethylene diamine) has lower stability than $ [Ni{{(N{{H}_{3}})}_{6}}C{{l}_{2}}] $ . Reason: In $ [Ni{{(en)}_{3}}C{{l}_{2}}] $ the geometry of Ni is trigonal bipyramidal.

• A. If both assertion and reason are true and reason is not the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false

Answer 1

Answer: (D)

In $ [Ni{{(en)}_{3}}]C{{l}_{2}}, $ ethylene diamine (en) is a bidentate ligand, hence it forms chela- ting ring with $ \text{N}{{\text{i}}^{\text{2+}}} $ in. Chelates are comparatively more stable, hence $ \text{ }\!\![\!\!\text{ Ni(en}{{\text{)}}_{3}}\text{ }\!\!]\!\!\text{ C}{{\text{l}}_{2}} $ is more stable than $ [Ni{{(N{{H}_{3}})}_{6}}]C{{l}_{2}}. $