Question

Why C2H5Cl gets hydrolysed easily than C6H5Cl?

Answer 1

The lone pair of a chlorine atom is delocalised over the conjugated double bond ring of benzene which adds a double bond character to the C-Cl bond of the chlorobenzene which makes the bond shorter and stronger, so the hydrolysis becomes difficult while in alkyl halides like ethyl chloride there is a single bond and polarity too which is easily hydrolyzed.