The fluorine molecule is formed by

$A$ molecule $(X)$ has $(i)$ four sigma bonds formed by the overlap of $sp^2$ and $s$ orbitals,(ii) one sigma bond formed by $sp^2$ and $sp^2$ orbitals,and (iii) one $\pi$ bond formed by $p_z$ and $p_z$ orbitals. Which of the following is $X$?

Among the following ions,the $p\pi - d\pi$ overlap could be present in:

Which of the following statements is $NOT$ correct?

The total number of sigma $(\sigma)$ and pi $(\pi)$ bonds in an ethylene molecule are

Which one is stronger,$\sigma$ bond or $\pi$ bond? Why?