Assertion (A): Cis form of alkene is found to be more polar than the trans form.

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Q.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). [2024]

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:

1 Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

2 (A) is false but (R) is true

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

4 (A) is true but (R) is false

Ans.
(3)

Generally in cis alkenes, dipole moment is more than that of trans alkenes because in symmetrical trans alkenes, bond moments add to give zero net dipole moment.

Solution

1 Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

2 (A) is false but (R) is true

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

4 (A) is true but (R) is false

Ans.
(3)

Generally in cis alkenes, dipole moment is more than that of trans alkenes because in symmetrical trans alkenes, bond moments add to give zero net dipole moment.

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Solution

1 Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

2 (A) is false but (R) is true

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

4 (A) is true but (R) is false

Ans. (3) Generally in cis alkenes, dipole moment is more than that of trans alkenes because in symmetrical trans alkenes, bond moments add to give zero net dipole moment.

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Ans.
(3)

Generally in cis alkenes, dipole moment is more than that of trans alkenes because in symmetrical trans alkenes, bond moments add to give zero net dipole moment.