In regions affected by either natural or anthropogenic gaseous emissions, two categories of chemical reactions frequently contribute significantly to the loss of the hydroxyl radical. These reactions do NOT involve. Select one a hydrogen abstraction with toluene. b. hydrogen abstraction with formaldehyde. c. addition reaction with ethylene, d. addition reaction with benzene. e synthetic formation of dimethyl sulfide The hydroxyl radical is formed in the troposphere by a variety of means but the most important is a four-step process. Which one of the following steps is NOT included? Select one: a. Ny H2O N20 H b.NO, hy > NO + O C.O+O+MO+M dos + hv 027 + 0* e. OH20200H