What is an electrophilic addition?

Which of the species shown below is the most stable form of the intermediate in the electrophilic addition of Cl_2 in water to cyclohexene to form a halohydrin ?

Methyl vinyl ether, H_2 C = CH – OCH_3 , reacts with Br_2 //CH_3OH . If methanol is reacting as water would, and if this reaction follows a typical mechanism of electrophilic addition, what would be the expected product ?

What are electrophiles?

Which is the most precise designation of stereochemistry for the products formed in the electrophilic addition of DBr to 1-methylcyclohexene ? ( D = ""^(2)H, an isotope of hydrogen)

Which of the following alkenes is expected to be more reactive towards electrophilic addition reactions ?

The attacking reagent in electrophilic sulphonation of benzene is :

An electrophilic reagent is :