5 monochloro derivative will be yield to when 2 methylbutane react with chlorine. 4 carbon atom are present in 2 methylbutane which react with chlorine. The chiral carbon that is carbon anti bonding react with chlorine to form four different groups around it hence it will stereoisomer
The answer is motion, this is what I would go with because when you are dealing with gases it puts motion in the term of particles.
Convection currents are flowing fluid that is moving because there is a temperature or density difference within the material. ... A temperature difference leads to an energy transfer from an area of higher energy to one of lower energy. Convection is a heat transfer process.