Given below are two statements.

Statement I : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.

Statement II : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number.

In the light of the above statements, choose the most appropriate answer from the options given below :

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)