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Which of the following groups has the highest priority according to Cahn-Ingold-prelog sequence rules?A.$C{H_3}$B.$C{H_2}Cl$C.$C{H_2}OH$D.CHO

Last updated date: 16th Jun 2024
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Hint: The Cahn-Ingold-prelog sequence rule says that the atom or the atoms present in the group having the highest atomic number which is directly adjoined with the central carbon atom is considered as the highest priority group.

In $C{H_3}$, the carbon atom is attached with three hydrogen atoms. The atomic number of hydrogen is one and the total atomic number will be 3.
In $C{H_2}Cl$, the carbon atom is attached to one chlorine atom and two hydrogen atoms 17 and the atomic number of hydrogen is 1. Therefore, the total atomic number will be 19.
In $C{H_2}OH$, The carbon atom is attached to three hydrogen atoms and one oxygen atom. The atomic number of oxygen is 8 and the atomic number of hydrogen is 1. The total atomic number will be 11.
According to the sequence rule, the highest priority will be given to $C{H_2}Cl$ and the lowest priority will be given to $C{H_3}$.
So, the priority order will be. $C{H_2}Cl > CHO > C{H_2}OH > C{H_3}$