The correct sequential addition of reagents in the preparation of 3-nitrobenzoic acid from benzene is :

Excess of isobutane on reaction with Br₂ in presence of light at 125$$^\circ$$C gives which one of the following, as the major product?

AB₃ is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is __________. (Integer answer)

These are physical properties of an element

(A) Sublimation enthalpy

(B) Ionisation enthalpy

(C) Hydration enthalpy

(D) Electron gain enthalpy

The total number of above properties that affect the reduction potential is ____________ (Integer answer)