Which of the following groups has the highest priority according to the Cahn-Ingold-Prelog sequence rules?

C H_{3}

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C H_{2} C l

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C H_{2} O H

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C H O

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Solution

The correct option is A $C H_{2} C l$
According to the Cahn-Ingold-Prelog sequence rules:
Compare the atomic number (Z) of the atoms directly attached to the stereocenter; the group having the atom of higher atomic number receives higher priority.
Sequence of priority is: $C H_{2} C l$ > $- C H O$ > $C H_{2} O H$ > - $C H_{3}$

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