Draw the structures of the major monohalo product for each of the following reactions:

(a) Define crystal field splitting energy. On the basis of crystal field theory, write the electronic configuration for d⁴ ion if Δ_O < P.

(b) [Ni(CN)₄]^2– is colorless whereas [Ni(H₂O)₆]²⁺ is green. Why? (At. no. of Ni = 28)

What happens when?

(a) (CH₃)₃C–OH is treated with Cu at 573K,

(b) Anisole is treated with CH₃Cl / anhydrous AlCl₃,

(c) Phenol is treated with Zn dust.

Write chemical equations in support of your answer.

Account for the following:

(a) CuCl₂ is more stable than Cu₂Cl₂.

(b) Atomic radii of 4d and 5d series elements are nearly same.

(c) Hydrochloric acid is not used in permanganate titrations.

Define the following terms:

(a) Tranquilizer

(b) Anionic detergent

(c) Disinfectant