The boiling point of $CC{l}_4$ is higher than that of $CHC{l}_3$ because :

(1) The dipole moment of $CC{l}_4$ is greater than that of $CHC{l}_3$

(2) $CC{l}_4$ forms hydrogen bonds.

(3) $CC{l}_4$ has higher molecular mass than that of $CHC{l}_3$

(4) $CC{l}_4$ is more ionic than $CHC{l}_3$

Assertion:  Compounds of Hg²⁺ ions, having an ionic radius of 116 pm, are more covalent in character than compounds of Ca²⁺ ions, even though Ca²⁺ has nearly the same ionic radius (114 pm) and the same charge.

Reason: For cations having the same size and charge, a cation with an (n−1)d¹⁰ns⁰ electronic configuration has greater polarizing power than a cation with an (n−1)s²(n−1)p⁶ns⁰ electronic configuration.

1.  Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.

2.  Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.

3.  Assertion is true, but Reason is false.

4.  Assertion is false, but Reason is true.

Given below are two statements:

Assertion : $\mathrm{}\mathcal{}$ F bond angle P = bond angle Q but not precisely $90°.$

Reason : The molecule is slight bent T-shaped and there is repulsion between lone pairs of electrons.

Assertion : ${\mathrm{N}}_2{{\mathrm{F}}_3}^{+}$ is planar at each nitrogen atom.

Reason : ${\mathrm{N}}_3\mathrm{H},$ the bond angle $\mathrm{H}‐\mathrm{N}‐\mathrm{N}$ is $120°$ and both the $\mathrm{N}‐\mathrm{H}$ bond lengths are not equal.

Assertion : Carbon has unique ability to form $\mathrm{p\pi }-\mathrm{p\pi }$ multiple bonds with itself and with other

                  atoms of small size and high electronegativity.

Reason : Heavier elements of group ${14}^{\mathrm{th}}$ do not form $\mathrm{p\pi }-\mathrm{p\pi }$ multiple bonds with itself because

               their atomic orbitals are too large and diffuse to have effective overlapping.

Select the correct option based on statements below:

Assertion : ${\mathrm{NO}}^{+}$ and ${\mathrm{CN}}^{-}$ both have same bond order and magnetism

Reason : ${\mathrm{NO}}^{+}$ and ${\mathrm{CN}}^{-}$ are isoelectornic species.

Assertion : Crystals of hydrated calcium sulphate $\left(\mathrm{gypsum}<mspace\; width="1em"></mspace>:<mspace\; width="1em"></mspace>{\mathrm{CaSO}}_4,<mspace\; width="1em"></mspace>2{\mathrm{H}}_2\mathrm{O}\right)$ are soft and easily cleaved.

Reason : Crystals of anhydrous calcium sulphate $\left(\mathrm{anhydrite}<mspace\; width="1em"></mspace>:<mspace\; width="1em"></mspace>{\mathrm{CaSO}}_4\right)$ are very hard and very difficult

               to cleave.

 When two atoms combine to form a molecule, energy is: