In which structure is the central carbon (C-3 | vedclass

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(B) chiral centre is a carbon atom bonded to four different groups. In a Fischer projection of a chain with three chiral carbons (like the ones shown,

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(B) chiral centre is a carbon atom bonded to four different groups. In a Fischer projection of a chain with three chiral carbons (like the ones shown,which are derivatives of pentane$-2,3,4-$triol or similar),the central carbon $(C-3)$ is the middle intersection point.Looking at the structures:- In structure $A$,$C-3$ is bonded to $H$,$Br$,the top group $(-CH(OH)CH_3)$,and the bottom group $(-CH(Br)CH_3)$. Since the top and bottom groups are different,$C-3$ is chiral.- In structure $B$,$C-3$ is bonded to $H$,$OH$,the top group $(-CH(Br)CH_3)$,and the bottom group $(-CH(Br)CH_3)$. Here,the top and bottom groups are identical $(-CH(Br)CH_3)$. Therefore,the central carbon $C-3$ is bonded to two identical groups and is not a chiral centre.- In structures $C$ and $D$,the groups attached to $C-3$ are different,making it chiral.Thus,in structure $B$,the central carbon is not chiral.

In which structure is the central carbon $(C-3)$ not a chiral centre?

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