Question

Given below are two statements.

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

Hint:

Key concepts: \begin{itemize} \item Dipole moment depends on charge magnitude and separation distance \item Conjugation affects both electronic distribution and bond lengths \item Partial double bond character decreases bond length \end{itemize}

Answer 1

The Correct Option is C

1. Analysis of Statement I:

• For \({CH_3-CH=CH-CH=O}\), the dipole moment ($\mu$) is calculated as $\mu = q \times d$.
• The conjugated system leads to increased charge separation.
• The distance between charges is greater compared to a saturated compound.

Consequently, a larger dipole moment is observed.

2. Analysis of Statement II:

• In \({CH_3-CH=CH-CH=O}\), the $C_1-C_2$ bond exhibits partial double bond character.
• Double bond character results in a shorter bond length.
• This is in contrast to a pure single bond found in \chemfig{CH_3-CH_2-CH_2-CH=O}.
  Statement II is FALSE
  (The actual bond length is shorter).