Why Allyl Halides Are More Reactive Than Vinyl Halides

In allyl halides the double bond is in conjugation with lone pair on halides.

Why allyl halides are more reactive than vinyl halides.

Halo alkane and haloarene organic chemistry class 12 compounds. Aryl halides are less reactive towards nucleophilic substitution reaction due to several reasons. Whereas alkyl halides undergo nucleophilic substitution easily. The resonating structures have negative charge on terminal carbon which is very unstable and hence the allyl halides are highly reactive.

In alkyl halides carbon atom of c x bond is sp3 hybridised while in aryl halides the carbon atom attached to halogen is sp2 hybridised. So it is difficult to break the c x bond. Answer here is the answer to the question vinyl halides are less reactive than alkyl halides. Following factors are responsible for the low reactivity of aryl halides towards nucl.

The thyroid hormones t 3 and t 4 are exceptions. Pankaj singh chemistry expert explains why aryl halides are less reactive than alkyl halides for nucleophilic substitution. Vinyl halides are less reactive than alkyl halides. The sp2 hybridised carbon atom with greater s character is more electronegative.

This is because c x bond in vinyl halides have partial double bond character due to resonance.