The relative rates of reaction of ethane, toluene, and ethylbenzene with bromine atoms have been measured.
the most reactive hydrocarbon undergoes hydrogen atom abstraction a million times faster than does the least reactive one.

arrange these hydrocarbons in order of decreasing reactivity.

particle   p is an electron and particle q is a neutron

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

i think that the answer is c