Which of the following molecules does not occur in left- and right-handed forms (carbon is the central atom and the groups around this central atom are in parentheses)?

Question

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For a molecule to have left- and right-handed forms (enantiomers), it must be chiral. A chiral molecule has a carbon atom attached to four different groups. In option C, the carbon atom is attached to two identical ethyl groups (C₂H₅), making it achiral and thus incapable of existing in left- and right-handed forms.

Which of the Following Molecules Does Not Occur in Left-