MCQ 11 Mark
Assertion (A): In comparison to ethyl chloride it is difficult to carry out nucleophilic substitution on vinyl chloride.
Reason (R): Vinyl group is electron-donating.
Reason (R): Vinyl group is electron-donating.
- ABoth A and R are true and R is the correct explanation of A .
- BBoth A and R are true but R is not the correct explanation of A.
- ✓A is true but R is false.
- DA is false but R is true.
Answer
View full question & answer→Correct option: C.
A is true but R is false.
(c) A is true but R is false.
Explanation: $CH _2= CH - Cl$ has some partial double bond character between carbon and a chlorine atom. So, nucleophilic substitution is difficult to carry as it is difficult to break the partial double bond in vinyl chloride than ethyl chloride $CH _3 CH _2$
→ Cl where there is no double bond character.
The vinyl group is not electron-donating. The carbon halogen bond in vinyl halides has some double-bond character and thus a little difficult to break.
Explanation: $CH _2= CH - Cl$ has some partial double bond character between carbon and a chlorine atom. So, nucleophilic substitution is difficult to carry as it is difficult to break the partial double bond in vinyl chloride than ethyl chloride $CH _3 CH _2$
→ Cl where there is no double bond character.
The vinyl group is not electron-donating. The carbon halogen bond in vinyl halides has some double-bond character and thus a little difficult to break.