The most stable conformation of the following compound is

Which of the following compounds has a plane of symmetry?
$R = -CH(Cl)-CH_3$
$S = -CH(Cl)-Br$

$A$ pair of stereoisomers might be classified in various ways. Which of the following statements are true with respect to pairs of stereoisomers?
$a$. They might be configurational isomers
$b$. They might be diastereomers
$c$. They might be constitutional isomers
$d$. They might be tautomers
$e$. They might be conformational isomers
$f$. They might be enantiomers
$g$. They might be positional isomers

The binaphthol $(Bnp)$ is

Which is the most stable chair form of this compound?

Which of the following compounds is chiral but does not contain a chiral carbon?