NCl₃

AsCl₃

SbCl₃

PCl₃

Nitrogen cannot form $$d\pi - p\pi$$ bond.

Single N – N bond is weaker than the single P – P bond

N₂O₄ has two resonance structures

The stability of hydrides increases from NH₃ to BiH₃ in group 15 of the periodic table

The vapour at 200^oC consists mostly of S₈ rings

At 600^oC the gas mainly consists of S₂ molecules

The oxidation state of sulphur is never less than +4 in its compounds

S₂ molecule is paramagnetic.

$$BH_4^-$$

$$BF_6^{3-}$$

$$B(OH)_4^-$$

$$BO_2^-$$