Identify A and B in the given chemical reaction sequence :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : $$\mathrm{NH}_3$$ and $$\mathrm{NF}_3$$ molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of $$\mathrm{NH}_3$$ is greater than that of $$\mathrm{NF}_3$$.

Reason (R) : In $$\mathrm{NH}_3$$, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the $$\mathrm{N}-\mathrm{H}$$ bonds. $$\mathrm{F}$$ is the most electronegative element.

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

Consider the given chemical reaction :

Product "A" is :

The correct statements from the following are :

(A) The decreasing order of atomic radii of group 13 elements is $$\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}$$.

(B) Down the group 13 electronegativity decreases from top to bottom.

(C) $$\mathrm{Al}$$ dissolves in dil. $$\mathrm{HCl}$$ and liberates $$\mathrm{H}_2$$ but conc. $$\mathrm{HNO}_3$$ renders $$\mathrm{Al}$$ passive by forming a protective oxide layer on the surface.

(D) All elements of group 13 exhibits highly stable +1 oxidation state.

(E) Hybridisation of $$\mathrm{Al}$$ in $$[\mathrm{Al}(\mathrm{H}_2 \mathrm{O})_6]^{3+}$$ ion is $$\mathrm{sp}^3 \mathrm{d}^2$$.

Choose the correct answer from the options given below :