JEE Main 2022 · 24 Jun · Shift 2 · Chemistry Q74

ChemistrySingle correct+4 / -1Question 74 of 90

Given below are two statements.

Statement I: The presence of weaker $\pi$ -bonds make alkenes less stable than alkanes.

Statement II: The strength of the double bond is greater than that of carbon-carbon single bond.

In the light of the above statements, choose the correct answer from the options given below.

Both Statement I and Statement II are correct.

Both Statement I and Statement II are incorrect.

Statement I is correct but Statement II is incorrect.

Statement I is incorrect but Statement II is correct.

Answer and worked solution

Official answer: A

Statement I is correct: the $\pi$ bond is weaker than a $\sigma$ bond, so alkenes are more reactive (less stable) than alkanes.

Statement II is correct: a C=C bond (about 614 kJ mol $^{-1}$ ) is stronger overall than a C-C bond (about 348 kJ mol $^{-1}$ ).

(A)

Topics:Alkenes Bond parameters and dipole moment

JEE Main 2022 · 24 Jun · Shift 2, Chemistry question 74