7. Answer the following

iii. Observe the following and answer the questions given below.

a. Name the type of halogen derivative
b. Comment on the bond length of  C-X bond in it
c. Can react by SN1 mechanism? Justify your answer.


a) Vinylic halide
b) The bond length of C – X bond is expected to be shorter than C – X bond in haloalkanes.
c) It does not undergo an SN1 mechanism.
The bond between the sp2 hybridized carbon atom and the halogen is exceptionally strong.
The electrons of the –X atom are in conjugation with the π bond, giving the C – X bond a double bond character.
When a nucleophile approaches the sp2 carbon, it experiences repulsion from the π-electrons of the double bond.

10 Halogen Derivative Page 233