Which of the following statements are correct for butadiene C 4 H 2 = C 3 H - C 2 H = C 1 H 2 (1) The C 1 - C 2 and C 3 - C 4 bonds are longer than a carbon-carbon double bond. (2) The C 1 - C 2 and C

Question

Which of the following statements are correct for butadiene

$\overset{4}{C} H_{2} = \overset{3}{C} H - \overset{2}{C} H = \overset{1}{C} H_{2}$

(1) The $C_{1} - C_{2}$ and $C_{3} - C_{4}$ bonds are longer than a carbon-carbon double bond.

(2) The $C_{1} - C_{2}$ and $C_{3} - C_{4}$ bonds are shorter than a carbon-carbon double bond.

(3) The $C_{2} - C_{3}$ bond is slightly shorter than a carbon-carbon single bond.

(4) The $C_{2} - C_{3}$ bond is slightly longer than a carbon-carbon double bond.

TestHub · Accepted Answer

Consider the following resonance structure

The structures (2) and (3) show the partial single-bond character of the $C_{1} - C_{2}$ and $C_{3} - C_{4}$ bonds, and (4) and (5) the partial double-bond character of the $C_{2} - C_{3}$ bond. This explains the observed anomalies in the bond distances.

Chemistry - CHEMICAL BONDING Question with Solution | TestHub

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