While assigning R, S configuration the correct order of priority of groups attached to chiral carbon atom is

Question

While assigning R, S configuration the correct order of priority of groups attached to chiral carbon atom is (A) CONH2 > COCH3 > CH2OH > CHO (B) CONH2 > COCH3 > CHO > CH2OH (C) COCH3 > CONH2 > CHO > CH2OH (D) CHO > CH2OH > COCH3 > CONH2

Tardigrade Admin · Accepted Answer

The correct priority order for the groups attached to chiral carbon atom is

CON H_{2} > COC H_{3} > C H O > C H_{2} O H

This order can be explained by these two rules:
(i) Higher priority is assigned to atoms (directly attached to the carbon atom) of higher atomic number.
(ii) A doubly or triply bonded atom is considered equivalent to two or three such atoms.

Q. While assigning $R$ , $S$ configuration the correct order of priority of groups attached to chiral carbon atom is

$CON H_{2} > COC H_{3} > C H_{2} O H > C H O$

$CON H_{2} > COC H_{3} > C H O > C H_{2} O H$

$COC H_{3} > CON H_{2} > C H O > C H_{2} O H$

$C H O > C H_{2} O H > COC H_{3} > CON H_{2}$

Q. While assigning R, S configuration the correct order of priority of groups attached to chiral carbon atom is

CONH2​>COCH3​>CH2​OH>CHO

CONH2​>COCH3​>CHO>CH2​OH

COCH3​>CONH2​>CHO>CH2​OH

CHO>CH2​OH>COCH3​>CONH2​

Q. While assigning $R$ , $S$ configuration the correct order of priority of groups attached to chiral carbon atom is

$CON H_{2} > COC H_{3} > C H_{2} O H > C H O$

$CON H_{2} > COC H_{3} > C H O > C H_{2} O H$

$COC H_{3} > CON H_{2} > C H O > C H_{2} O H$

$C H O > C H_{2} O H > COC H_{3} > CON H_{2}$