2) (see chapter 1 additional problem 3 in text) a proposed mechanism for ozone destruction in the lower stratosphere begins with photodissociation of ciono, to ci and no3, followed by photodissociation of noz to no and o2. deduce a catalytic ozone destruction cycle, requiring no atomic oxygen, which incorporates these reactions. what is the overall reaction? 3) (see problem 2-4 in text) reactions of the type oh + cf, cl, → hof + cfc1, are conceivable tropospheric sinks for cfcs. given that c-f bonds are much stronger than o-f bonds, can you deduce why, at low temperatures, these reactions do not occur to any appreciable extent? 4) (see chapter 2 additional problem 9 in text) consider the following four compounds: cfci3, chfcl2, cf3cl and chf3. assuming that equal numbers of moles of each were released into the air at ground level, rank these four compounds in terms of their potential to catalytically destroy ozone in the stratosphere. explain your reasoning.