Question

Assertion :Resonance can occur when all the atoms involved lie in the same plane or nearly in the same plane. Reason: $C{H}_3-\underset{O}{\underset{||}{C}}-C{H}_3$ and $C{H}_3-\underset{OH}{\underset{|}{C}}=C{H}_2$ are resonating structures.

• A. Both Assertion and Reason are true and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are true but Reason is not the correct explanation for Assertion
• C. Assertion is true statement but Reason is false
• D. Both Assertion and Reason are false statements.

Answer 1

The correct option is B Both Assertion and Reason are true but Reason is not the correct explanation for Assertion

Here both Assertion and Reason are true but the Reason is actually an explanation for hyperconjugation, not for Resonance. No reference to the need for planarity is made clear by the example.
Hence, option $B$ is correct.