The correct statement about the compounds $A$ and $B$ is
$A$ and $B$ are identical
$A$ and $B$ are diastereomers
$A$ and $B$ are enantiomers
None of these
The $S$ - enantiomer of ibuprofen is responsible for its pain-relieving properties.Which one of the following structures shown below is $(S)$ -ibuprofen ?
$d-$ tartaric acid and $l-$ tartaric acid are
A similarity between optical and geometrical isomerism is that
Which of the following structures represents the lowest-energy form of $(1S, 2S,
4R)$ -trimethyl -cyclohexane?
Which of the following is a meso compound ?