Question

Assertion :Alkene $A({Me}_{2}C=C{Me}_2)$ is more stable than alkene $B({Et}_{2}C=C{Et}_2)$. Reason: Baker - Nathan effect.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Alkene $A({Me}_{2}C=C{Me}_2)$ is more stable than alkene $B({Et}_{2}C=C{Et}_2)$.
This is due to Baker - Nathan effect.
Hyperconjugation is also called Baker - Nathan effect. In (A), there are 12 $\alpha -H$ atoms, whereas $B$ has only 8 $\alpha -H$ atoms.
Thus, in A, the extent of hyperconjugation is more than in B. This leads to greater stability.
Thus, both (A) and (R) are correct and (R) is the correct explanation of (A).