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JEE · NEET Previous Year Question

$Which of the following has the shortest C - Cl bond?$

Topic: JEE PYQ

Answer: A. Full step-by-step solution below.

A $Cl - CH = CH - N O_{2}$
B $Cl - CH = CH - C H_{3}$
C $Cl - CH = C H_{2}$
D $Cl - CH = CH - OC H_{3}$

Correct answer: A

Solution

(a) Resonance form of C l - C H = C H - N O_{2} is more stable than resonance form of any other given compounds. Hence, double bond character in carbon-chlorine bond is maximum and bond length is shortest.

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