• Addition of HBr to alkenes may proceed by a free-radical mechanism .
• Ammonia molecules add to other molecules or ions through the mechanism of covalent-bond formation.
• Addition of HBr to alkenes may proceed by a free-radical mechanism .
• Ammonia molecules add to other molecules or ions through the mechanism of covalent-bond formation.
Циммерман М., Веденеева К.. Русско-Английский научно-технический словарь переводчика. Russian-English scientific dictionary for translators. 2012