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PAN or PBN is formed in photochemical sm...

PAN or PBN is formed in photochemical smog by

A

The action of nitrogen oxides on unburnt hydrocarbons in presence of sunlight

B

The action of `CO_(2)` on unburnt hydrocarbons in the presence of sunlight

C

The action of `H_(2)S` on unburnt hydrocarbons in the presence of sunlight

D

The action of `O_(2)` on hydrocarbons.

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