The correct relationship between the boiling points of very dilute solutions of ${\mathrm{AlCl}}_3\left({\mathrm{t}}_1\right)$ and ${\mathrm{CaCl}}_2\left({\mathrm{t}}_2\right)$, having the same molar concentration is

We know that,

Elevation of boiling point $\Delta {\mathrm{T}}_{\mathrm{b}}={\mathrm{iK}}_{\mathrm{b}}\mathrm{m}$

$\Delta {\mathrm{T}}_{\mathrm{b}}$ is directly proportional to Vant Haff factor$\left(\mathrm{i}\right)$ as molar concentration is same for both.

And,

We know that ${\mathrm{i}}_{{\mathrm{AlCl}}_3}=4$ and  ${\mathrm{i}}_{{\mathrm{CaCl}}_2}=3$

Therefore,

${\mathrm{i}}_{{\mathrm{AlCl}}_3}>{\mathrm{i}}_{{\mathrm{CaCl}}_2}$

So, we get:

$t_1>t_2$  

Hence, option (B) is correct.