While assigning R and S configuration,the cor | vedclass

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Question

(B) According to the Cahn-Ingold-Prelog $(CIP)$ priority rules,priority is assigned based on the atomic number of the atoms directly attached to the c

Vedclass · Accepted Answer

$CONH_2 > COCH_3 > CHO > CH_2OH$

Vedclass · Answer

(B) According to the Cahn-Ingold-Prelog $(CIP)$ priority rules,priority is assigned based on the atomic number of the atoms directly attached to the chiral center. If the atoms are the same,we look at the next atoms in the chain.$1$. Compare the first atoms: All groups $(CONH_2, COCH_3, CHO, CH_2OH)$ are attached via a carbon atom.$2$. Look at the atoms attached to these carbons:- $CONH_2$ (Carbon is bonded to $O, O, N$)- $COCH_3$ (Carbon is bonded to $O, O, C$)- $CHO$ (Carbon is bonded to $O, O, H$)- $CH_2OH$ (Carbon is bonded to $O, H, H$)$3$. Comparing the atoms attached to the carbonyl/first carbon:- $N$ (atomic number $7$) > $C$ (atomic number $6$) > $H$ (atomic number $1$).$4$. Thus,the priority order is: $CONH_2 > COCH_3 > CHO > CH_2OH$.

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

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