Which equilibrium is not rapid at room temperature?

The maximum number of possible isomers (including stereoisomers) which may be formed on mono-bromination of $1-$methylcyclohex$-1-$ene using $Br_2$ and $UV$ light is. . . . . .

Determine the total number of stereoisomers possible for the following compound:
Structure: $A$ cyclopentene ring with a $-CH=CH-CH_2-CH_3$ group at position $1$ and a $-CH=CH_2$ group at position $2$.

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

The correct order of enol contents $x$,$y$,$z$ is

What is the possible number of stereoisomers for the compound $CH_3-CH=CH-CH(OH)-CH_3$?