Number of monobromination products possible for the given hydrocarbon [without stereo isomers]

Define stereo-isomers.

Total number of mono chlorinated compounds are possible for cumene (including stereo isomers)

Number of geometrical isomers possible of

Number of geometrical isomers possible of

Number of optical isomers possible for

Product on monobromination of this compound is

product on monobromination of this compound is

The maximum number of structural isomers possible for the hydrocarbon having the molecular formula C_(4)H_(6) , is