Q.

In double covalent bond, there is sharing of:

1 2 electrons  
2 4 electrons  
3 6 electrons  
4 3 electrons  

Ans.

(2)

A double covalent bond is formed when two pairs of electrons are shared between them. For example, in an oxygen molecule, there is a double bond between two oxygen atoms as they share two pairs of electrons i.e., 4 electrons.