The structural formula of cocaine is shown below. How many stereogenic carbon atoms are there in this molecule ?
$1$
$2$
$3$
$4$
The Fischer projection of $D$-erythrose is shown below.
(image)
$D$-Erythrose and its isomers are listed as $P , Q , R$, and $S$ in Column-$I$. Choose the correct relationship of $P , Q , R$, and $S$ with D-erythrose from Column $II$.
(image)
The stereoisomers that are formed by electrophilic addition of bromine to trans$-$but$-2-$ene is/are:
Which one of the following objects is ‘achiral’
How many chiral isomers can be drawn from $2-$bromo, $3-$chloro butane
Rotation of plane polarised light is measured by