When 1-bromo-3-chlorocyclobutane reacts with two equivalents of metallic sodium in ether, then the product will be?

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:

The major product of the following reaction is:

The major product of the following reaction is:

In the reaction