# Question #e302f

Here in the Fischer's projection formula H atoms linked with both ${C}_{2} \mathmr{and} {C}_{3}$ chiral carbon atoms are kept in horizontal lines and following CIP rule on both ${C}_{2} \mathmr{and} {C}_{3}$ chiral carbon atoms the rotations in going along descending order of priority excluding H atom of least priority are in anticlockwise direction . So both ${C}_{2} \mathmr{and} {C}_{3}$ chiral carbon atoms will be marked as R.
For ${C}_{2} \text{The order} \to - O H > {C}_{2} {H}_{5} \left(C {H}_{3}\right) C H - . > C {H}_{3} -$
For ${C}_{3} \text{The order} \to C {H}_{3} C H O H - . > {C}_{2} {H}_{5} - . > C {H}_{3} -$