Final answer:
F₂ and I₂ are not commonly used in electrophilic addition reactions because they are not good electrophiles. They add to a double bond through a different mechanism called free radical addition.
Step-by-step explanation:
F2 and I2 are not commonly used in electrophilic addition reactions because they are not good electrophiles. Electrophilic addition reactions involve the addition of an electrophile to a double or triple bond. While F2 and I2 are capable of adding to a double bond, they do so through a different mechanism called free radical addition. In this mechanism, a free radical is generated and reacts with the double bond.
This is different from the electrophilic addition reactions that typically involve the addition of a positively charged electrophile.