Question

allyl chloride is hydrolysis more readily than n-propylchloride, why?

Answer 1

The ease of hydrolysis depends upon the stability of carbocation formed. 
In case of allyl chloride the carbocation is resonance stabilized which does not happen in case of n-propyl chloride,  that's why it is hydrolyzed more easily

Answer 2

Hey !!

Allyl chloride shows high reactivity as the carbocation formed by hydrolysis is stabilised by resonance while no such stabilisation of carbonation exists in the case of n-propyl chloride.

 CH₂ = CH ---- CH₂ ---- Cl --(Ionisation) (SLOW) --> CH₂ = CH ---- CH₂⁺ + Cl⁻

CH₂ = CH ---- CH₂OH --(OH⁻)--> (FAST) CH₂⁺ ---- CH = CH₂

Now, on the other hand, n-propyl chloride does not undergo ionisation to produce carbocation and hence allyl chloride is hydrolysed more readily than n-propyl chloride.

Good luck !