Question

Which of the following overlaps gives $\sigma -$ bond along x-axis as internuclear axis?

• A. $P_z$ and $P_z$
• B. $s$ and $P_z$
• C. $s$ and $P_y$
• D. $d_{x^2-y^2}$ and $d_{x^2-y^2}$

Answer 1

The correct option is A $P_z$ and $P_z$

Sigma bond is always formed between $2$ half filled atomic orbitals along their inter-molecular axis, i.e. the line joining the centres of the nucler of $2$ atoms (axial overlapping).

From given data, if we consider x-axis as the intermolecular axis, $P_z+P_z$ overlapping is not possible as both lie on $z$- axis.

So, the option $A$ is the correct answer.