JEE Mains · Chemistry · STD 11 - 8.2 Organic chemistry isomerism

Given below are two statements: one is labelled as Assertion \((A)\) and the other is labelled as Reason \((R)\). Assertion \((A)\): Cis form of alkene is found to be more polar than the trans form Reason \((R)\): Dipole moment of trans isomer of \(2\)-butene is zero. In the light of the above statements, choose the correct answer from the options given below :

A Both \((A)\) and \((R)\) are true but \((R)\) is NOT the correct explanation of \((A)\)
B \((A)\) is true but \((R)\) is false
C Both (\(A\)) and \((R)\) are true and \((R)\) is the correct explanation of\((A)\)
D \((A)\) is false but \((R)\) is true

Verified Solution

Answer & Solution

Correct Answer

(C) Both (\(A\)) and \((R)\) are true and \((R)\) is the correct explanation of\((A)\)

Step-by-step Solution

Detailed explanation

Dipole moment is a vector quantity and for compound net dipole moment is the vector sum of all dipoles hence dipole moment of cis form is greater than trans form.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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