Question

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

• A. $Cl-CH=CH-N{O}_2$
• B. $Cl-CH=CH-C{H}_3$
• C. $Cl-CH=CH-OC{H}_3$
• D. $Cl-CH=C{H}_2$

Answer 1

Answer: (A)

$Cl-CH=CH-N{O}_2$ has the shortest $C-Cl$ bond due to resonance stabilised double bond character as follows