It has two 2e−3c bonds

It is an electrom deficient molecule

All the B−H bond lengths are equal

It has four 2e−2c bonds

N₂ does not react with metallic lithium at room temperature to form Li₃N

Hydrolysis of Mg₃N₂ gives NH₃

NH₃ is a stronger Lewis base than PH₃

Maximum covalency of nitrogen is 3

CO

CO₂

SO₂

SO₃

Al₄C₃

Be₂C

Mg₂C₃

Both (2) and (3)

There are 6 atoms in one plane

The B−H bond lengths are different

There are four 3c−2e bonds

It can not be methylated beyond B₂H₂Me₄