Question

Assertion: cis-3-chloroprop-2-enoic acid is less stable than its trans-form.
Reason: Dipole moment of ds-form is greater than trans-form.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (B)

Assertion is true because usually, for acrylic systems trans-isomers are more stable than cis- isomers. This is due to increased unfavourable steric interaction of the substituents in cis-isomer. Reason is also true because generally the dipole moment of trans-form is zero (or less) depending whether the substituents on both sides of double bond are same or not while cis-forms are polar in nature with certain value of dipole moment.