Allyl choride is more reactive than r-propyl chloride towards nucleophilic substiution reaction. Explain why ?

Explanation

Higher reactivity of ally chloride than n-propy chloride is due to the fact that intermediate carbocation obtained in case of allyl chloride on ionisation is résonance stabilised as shown below:
` underset("Alkyl chloride")(CH_2 =CH - CH_2 - Cl ) overset("slow")hArr CH_2 = CH= overset(+)(CH) + Cl^(-)`
` underset("Alkyi chloride")(CH_2= CH - overset(+) (CH_2)) hArr CH_2 - CH = CH_2`
` CH_2 = overset(+)(CH - CH_2 + OH^(-) overset("feat")hArr CH_2 OH )`
On the other hand, n-propyl chloride does not undergo ionisaticarbocation which is not resonance stabilised.