While assigning R, S configuration the correct order of priority of groups attached to chiral carbon atom is :
A
CONH2>COCH3>CH2OH>CHO
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B
CONH2>COCH3>CHO>CH2OH
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C
COCH3>CONH2>CHO>CH2OH
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D
CHO>CH2OH>COCH3>CONH2
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Solution
The correct option is DCONH2>COCH3>CHO>CH2OH While assigning R, S configuration the correct order of priority of groups attached to chiral carbon atom is CONH2>COCH3>CHO>CH2OH Atomic having higher atomic number has higher priority. The decreasing order of atomic numbers is O>N>C>H In CONH2 group, the C atom is attached to 2 O atoms and one N atom. In COCH3 group, the C atom is attached to 2 O atoms and one C atom. In CHO group, the C atom is attached to 2 O atoms and one H atom. In CH2OH group, the C atom is attached to 2 H atoms and one O atom.