Number of electron deficient molecules among the following ${\mathrm{PH}}_3,{\mathrm{B}}_2{\mathrm{H}}_6,{\mathrm{CCl}}_4,{\mathrm{NH}}_3,\mathrm{LiH}$ and ${\mathrm{BCl}}_3$ is

How many of the following molecules are with non-zero net dipole moment,

Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List - II and select the most appropriate option.

Arrange the following in the decreasing order of their covalent character :

(A) $\mathrm{LiCl}$

(B) $\mathrm{NaCl}$

(C) $\mathrm{KCl}$

(D) $\mathrm{CsCl}$

Choose the most appropriate answer from the options given below