Discussion
Which deficiency does the Chapman scheme have?
Answer: B
Pure oxygen chemistry gives roughly twice the observed ozone amount, and the discrepancy is made up by catalytic destruction cycles involving nitrogen, hydrogen and halogen radicals. Identifying those cycles was a major achievement of atmospheric chemistry in the 1970s. The altitude of the predicted layer is approximately right, which is why the scheme remains the starting point for any discussion. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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