hullo help

[binayakafle]

Why C-Cl bond of Chlorobenzene stronger than that of chloroethane?
i tried so hard but couldnot solve.. plz help
i dont think doble bond of c in c6h6 ork here

[Sonic]

There is a ring of delocalised electrons in benzene and it's derivatives. This draws away electron density making the C more electropositive giving greater difference in electronegativity making the bond stronger

[hana]

Also,in alkyl halides like chloroethane,the alkyl groups are electron releasing in nature so more the no. of alkyl groups attached to a carbocation,the more the delocalisation of the +ve charge on the carbocation,the more the carbocation is stabilised and as sonic says , I guess the electronegativity diff. in this particular C-Cl bond would be lowered ,thus making the bond weaker .