Molality $$(\mathrm{m})$$ of $$3 \mathrm{M}$$ aqueous solution of $$\mathrm{NaCl}$$ is : (Given : Density of solution $$=1.25 \mathrm{~g} \mathrm{~mL}^{-1}$$, Molar mass in $$\mathrm{g} \mathrm{~mol}^{-1}: \mathrm{Na}-23, \mathrm{Cl}-35.5$$)

Evaluate the following statements related to group 14 elements for their correctness.

(A) Covalent radius decreases down the group from $$\mathrm{C}$$ to $$\mathrm{Pb}$$ in a regular manner.

(B) Electronegativity decreases from $$\mathrm{C}$$ to $$\mathrm{Pb}$$ down the group gradually.

(C) Maximum covalance of $$\mathrm{C}$$ is 4 whereas other elements can expand their covalance due to presence of d orbitals.

(D) Heavier elements do not form $$\mathrm{p} \pi-\mathrm{p} \pi$$ bonds.

(E) Carbon can exhibit negative oxidation states.

Choose the correct answer from the options given below :

Arrange the following elements in the increasing order of number of unpaired electrons in it.

(A) $$\mathrm{Sc}$$

(B) $$\mathrm{Cr}$$

(C) $$\mathrm{V}$$

(D) $$\mathrm{Ti}$$

(E) $$\mathrm{Mn}$$

Choose the correct answer from the options given below :

The major products formed :

A and B respectively are :