Explain the formation of butane by using Frankland reaction?

The major product of the following reaction is:

The increasing order of reactivity of the following compounds towards reaction with alkyl halides directly is:

$\left(i\right)$

$\left(ii\right)$

$\left(iii\right)$

$\left(iv\right)$

The major product of the following reaction is:

For the following compounds the correct statement(s) with respect to nucleophilic substitution reactions is(are)

The major product of the following reaction is: