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  4. Which one of the following molecules contains no π bond ?

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Q. Which one of the following molecules contains no $\pi$ bond ?

NEETNEET 2013Chemical Bonding and Molecular Structure

Solution:

All the molecules have O-atom with lone pairs, but in $H_2 O$ the H-atom has no vacant (in oxygen atom, absence of d-orbital) orbital for $\pi$-bonding.
That- why it does not have any $\pi$-bond.
In all other given molecules, the central atom because of the presence of vacant orbitals is capable to form $\pi$-bonds.