What is the total number of possible isomers of the following formula?

${\mathrm{C}}_2{\mathrm{H}}_3{\mathrm{Br}}_2\mathrm{Cl}$

In the given stereoisomer, after replacing H_x with T and H_y with D, structure M is obtained. But, by replacing H_y with T and H_x with D (In original stereoisomer), structure N is obtained. M and N represent a pair of:

Choose the incorrect statement from the following:

If optical rotation produced by  is $+36°$, then the one produced by    is:

Identify the mismatch:

(a)  

(b)  

(c)  

(d)  

A mixture of all stereoisomers possible from the structure is subjected to fractional distillation. How many fractions will be obtained from the following?