Allegra, a common prescription drug with the structure shown below, is given for the treatment of seasonal allergies. How many stereogenic carbon does Allegra possess ?
$1$
$2$
$3$
$4$
The absolute configuration of
The configuration at $C-2$ and $C-3$ of the compound given
Which of the following has chiral structure
For the given compound $X$, the total number of optically active stereoisomers is. . . . . . .
Which of the following is expected to be optically active