Why haloalkanes are more reactive than haloarenes towards nuclophilic subsition reaction ?

Why alkenes are more reactive than alkanes?

Explain why aldehydes are more reactive than ketones towards nucleophilic addition reactions ?

Aryl halide are less reactive than alkyl halides towards nucleophilic substitution reactions. Why ?

Allyl chloride is more reactive than n-propyl chloride towards nucleophilic substitution reaction. Explain why ?

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

Alkyl Chloride is more reactive than chlorobenzene towards nucleophilic substitution. Explain.

Benzyl chloride is more reactive than chlorobenzene towards nucleophilic substitution. Explain.