Statement I : The dipole moment of is greater than Statement II : bond length of is greater than bond length of [2025]

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Solution

Q.
Given below are two statements. [2025]

Statement I : The dipole moment of $\overset{4}{C} H_{3} - \overset{3}{C} H = \overset{2}{C} H - \overset{1}{C} H = O$ is greater than $\overset{4}{C} H_{3} - \overset{3}{C} H_{2} - \overset{2}{C} H_{2} - \overset{1}{C} H = O$

Statement II : $C_{1} - C_{2}$ bond length of $\underset{4}{{CH}_{3}} - \underset{3}{CH} = \underset{2}{CH} - \underset{1}{CH} = O$ is greater than $C_{1} - C_{2}$ bond length of $\underset{4}{{CH}_{3}} - \underset{3}{{CH}_{2}} - \underset{2}{{CH}_{2}} - \underset{1}{CH} = O$

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

1 Statement I is false but Statement II is true.

2 Both Statement I and Statement II are false.

3 Statement I is true but Statement II is false.

4 Both Statement I and Statement II are true.

Ans.
(3)

$δ_{1} > δ_{2} as electron withdrawal by - M effect is more. Also d_{1} > d_{2}, thus μ_{1} > μ_{2} . Due to partial double bond character x < y .$

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