why do alkyl halides undergo nucleophilic substitution whereas aryl halides undergo electrophilic?

there r 5 reasons:

1) due to resonance aryl halides also known as haloarenes form a partial double bond which is tough to brk

2) as haloarenes r sp2 hybridised dey have mre s character than in haloalkanes, n mre d s character mre elctronegativity n mre tightly d bond is held

3)in haloalkanes dere was nly - I effect bt in haloarenes - I is opposed by + R so polarity is partially cancelled

4)carbon ring is an electron rich system n so is d nucleophyle so dey feel repulsion

5) as d carbon has huge ring there will b steric repulsion so it wont undergo SN2 reaction. n as d carbocation is nt stable it will nt undergo SN1 reation.