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Which one of the following molecules is...

Which one of the following molecules is planar?

A

`BF_3`

B

`PH_3`

C

`NCl_3`

D

`NF_3`

Text Solution

Verified by Experts

The correct Answer is:
A
In a planar molecule, the central atom is bonded to 3 other atoms and has zero lone pair. In `PH_3`, `NCl_3`, and `NF_3`, the central atom has 5 valence electrons. Three are used up to form bonds with other atoms and two nonbonding electrons form a lone pair. Thus, these molecules have pyramidal shapes. In `BF_3`, the central B atom has 3 valence electrons. It has no lone pair as all are used up to form bonds with F atoms. Thus, `BF_3` is planar.
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