Examine the ten structures shown below and select those that satisfy each of the following conditions:

How many compounds give elimination reaction with $\mathrm{N}\stackrel{\oplus }{\mathrm{a}}\stackrel{⊝}{\mathrm{C}}\mathrm{N}?$

 

In the reaction

The major product of the following reaction is:

The reagent required for the following two step transformation are

The major product of the following reaction is:

The major product of the following reaction is:

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

$\left(i\right)$

$\left(ii\right)$

$\left(iii\right)$

$\left(iv\right)$