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(B) chiral carbon atom is a carbon atom bonded to four different groups.$1$. $2-$methylcyclohexanone: The carbon at position $2$ is bonded to $-H$,$-C

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$4$

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(B) chiral carbon atom is a carbon atom bonded to four different groups.$1$. $2-$methylcyclohexanone: The carbon at position $2$ is bonded to $-H$,$-CH_3$,$-C=O$ (part of ring),and $-CH_2$ (part of ring). It is chiral.$2$. Cyclopentane$-1,3-$dione: All carbons are achiral due to symmetry.$3$. $CH_3-CH_2-CH(NO_2)-COOH$: The central carbon is bonded to $-H$,$-NO_2$,$-COOH$,and $-CH_2CH_3$. It is chiral.$4$. $CH_3-CH(I)-CH_2-NO_2$: The carbon bonded to $I$ is attached to $-H$,$-CH_3$,$-I$,and $-CH_2NO_2$. It is chiral.$5$. $CH_3-CH_2-CH(OH)-CH_2OH$: The carbon bonded to $OH$ is attached to $-H$,$-OH$,$-CH_2CH_3$,and $-CH_2OH$. It is chiral.$6$. $CH_3-CH_2-CH(I)-C_2H_5$: The carbon bonded to $I$ is attached to $-H$,$-I$,$-CH_2CH_3$,and $-CH_2CH_3$. Since two groups are identical $(-C_2H_5)$,it is achiral.Thus,compounds $1, 3, 4,$ and $5$ contain at least one chiral carbon atom. The total number is $4$.

Identify the total number of compounds containing at least one chiral carbon atom from the following list:
$1$. $2-$methylcyclohexanone
$2$. Cyclopentane$-1,3-$dione
$3$. $CH_3-CH_2-CH(NO_2)-COOH$
$4$. $CH_3-CH(I)-CH_2-NO_2$
$5$. $CH_3-CH_2-CH(OH)-CH_2OH$
$6$. $CH_3-CH_2-CH(I)-C_2H_5$

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Identify the total number of compounds containing at least one chiral carbon atom from the following list:$1$. $2-$methylcyclohexanone$2$. Cyclopentane$-1,3-$dione$3$. $CH_3-CH_2-CH(NO_2)-COOH$$4$. $CH_3-CH(I)-CH_2-NO_2$$5$. $CH_3-CH_2-CH(OH)-CH_2OH$$6$. $CH_3-CH_2-CH(I)-C_2H_5$