| Assertion [A] : Vinyl halides do not undergo nucleophilic substitution easily. |
| Reason (R) : Even though the intermediate carbocation is stabilized by loosely held \[\pi \text{-}\]electrons, the cleavage is difficult because of strong bonding. |
A) Both [A] and (R) are wrong statements
B) Both [A] and (R) are correct statements and (R) is the correct explanation of [A]
C) Both [A] and (R) are correct statements but (R) is not the correct explanation of [A]
D) [A] is a correct statement but (R) is a wrong statement.
Correct Answer: D
Solution :
Vinyl halide \[C{{H}_{2}}=CH-Cl\] do not undergo SN reaction This is due to formation of highly unstable carbocation \[(C{{H}_{2}}=\overset{\oplus }{\mathop{C}}\,H)\]; which cannot be delocalised by the \[\pi \text{-}\]electron, also \[CCl\] has double bond character because of resonance Hence statement (2) is wrong.
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