For a given alkyl group the densities of the halides follow the order

For a given alkyl group, the boiling points of alkyl halides follow the order :

For a given alkyl group , the boiling points of alkyl halides follow the order:

S_(N)1 reactive of alkyl halides follows the order-

How do the boiling points vary in alkyl halides with increase in the size of the alkyl group for the given halide and also of the halide for the given alkyl group?

In Wurtz reaction of alkyl halides, the reactivity of alkyl halides follows the decreasing order,