Number of electron deficient molecules among the following

PH₃, B₂H₆, CCl₄, NH₃, LiH and BCl₃ is

The correct order of bond orders of $${C_2}^{2 - }$$, $${N_2}^{2 - }$$ and $${O_2}^{2 - }$$

Identify the correct statement for B₂H₆ from those given below :

(A) In B₂H₆, all B-H bonds are equivalent.

(B) In B₂H₆, there are four 3-centre-2-electron bonds.

(C) B₂H₆ is a Lewis acid.

(D) B₂H₆ can be synthesized from both BF₃ and NaBH₄.

(E) B₂H₆ is a planar molecule.

Choose the most appropriate answer from the options given below :