The alkene that exhibits geometrical isomerism is :

The number of stereoisomers possible for a compound of the molecular formula CH₃ - CH = CH - CH(OH) - Me is :

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

The electrophile, $${E^ \oplus }$$ attacks the benzene ring to generate the intermediate $$\sigma - $$complex. Of the following, which $$\sigma - $$complex is lowest energy?