Stereochemistry of the product is

$A$ 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

In which of the following is the keto form more dominating than the enol form?

Which of the following compounds produces an optically inactive compound on hydrogenation $?$

Which of the following types of isomerism is shown by pentanone?

According to $CIP$ sequence rule,the correct arrangement in order of decreasing priority is :-