To assign a priority to an atom that is part of multiple bonds, treat the multiple bonds as an equivalent number of single bonds. Hence, option A is correct.
<h3>What is a stereogenic centre?</h3>
A carbon atom is a chiral (stereogenic) centre if it is tetrahedral (sp3) and has four different groups (ligands) attached to it.
To assign a priority to an atom that is part of multiple bonds, treat the multiply bonded atom as an equivalent number of singly bonded atoms.
If two isotopes are bonded to the stereogenic centre, the isotope with the higher mass number has a higher priority.
Hence, option A is correct.
Learn more about the stereogenic centre here:
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