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JEE Main levelSingle correct optionDifficulty 2 of 3cb131

With the internuclear axis along $z$ , which pair of atomic orbitals on the two atoms has zero net overlap by symmetry?

A $2 s$ on one atom and $2 p_{x}$ on the other
B $2 p_{x}$ and $2 p_{x}$
C $2 p_{z}$ and $2 p_{z}$
D $2 s$ and $2 p_{z}$

Answer: A

Overlap is non-zero only when the orbitals have the same symmetry about the axis.

2 s

is cylindrically symmetric (

σ

) while

2 p_{x}

is

π

-type, so their net overlap is zero. The other pairs overlap to give

σ

or

π

MOs.

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