Allegra, a common prescription drug with the structure shown below., is given for treatment of seasonal allergies. How many stereogenic carbon does Allegra possess ?
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Explanation :
· A stereogenic center refers to a chiral carbon.
· A chiral carbon is the one that shows optical isomerism, i. e., it deflects plane-polarized light when passed through its solution.
· For carbon to be chiral, it should be sp3 hybridized and it must have four different groups connected to it.
· There is one chiral carbon in Allegra, which is marked in red in the structure :
Hence, the number of stereogenic centers in Allega is 1.
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