1.

Assertion : In formaldehyde all the four atoms lie in one plane. Reason : Carbonyl carbon forms a pi-bond with oxygen by overlapping of p -orbitals.

Answer»

If both assertion and reason are true and reason is the correct EXPLANATION of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

Solution :The carbonyl carbon is `sp^(2)` hybridised and forms three sigma bonds. THUS carbonyl carbon and three atoms ATTACHED to it lie in the same plane and`pi`- electron CLOUD is above and below this plane.


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