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MCQMediumJEE Main 2025 · 4 April, Shift 1Electronic Effects (Inductive, Resonance, Hyperconjugation)

Chemistry Question from JEE Main 2025 · 4 April, Shift 1

Given below are two statements.

Statement I : The dipole moment of CH3−CH=CH−CH=O\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{O} (carbons numbered 4,3,2,14,3,2,1 from the methyl end) is greater than that of CH3−CH2−CH2−CH=O\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{O}.

Statement II : The C1−C2\mathrm{C}_{1}-\mathrm{C}_{2} bond length of CH3−CH=CH−CH=O\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{O} is greater than the C1−C2\mathrm{C}_{1}-\mathrm{C}_{2} bond length of CH3−CH2−CH2−CH=O\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{O}.

Image showing Statement I and Statement II comparing crotonaldehyde and butyraldehyde dipole moment and C1-C2 bond length with carbon numbering 4, 3, 2, 1 marked on both structures.

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

  • A

    Statement I is false but Statement II is true

  • B

    Both Statement I and Statement II are false

  • C

    Statement I is true but Statement II is false

  • D

    Both Statement I and Statement II are true

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