The incorrect statement from the following is
classical smog is also called reducing smog.
common components of classical smog are $\mathrm{O}_3, \mathrm{NO}, \mathrm{HCHO}$.
photochemical smog leads to cracking of rubber and corrosion of metals.
photochemical smog occurs in warm, dry and sunny climate.
IUPAC names of the given compounds (I) and (II) are respectively

5-phenyl-3- nitrobutane, 2-ethyl-2-methyl-1-propylcyclohexane
2-nitro-1-phenylbutane; 2-ethyl-2-methyl-1-propylcyclohexane
2-nitro-1-phenylbutane; 1-ethyl-1-methyl-2-propylcyclohexane
3-nitro-5-phenylbutane; 1-ethyl-1-methyl-2-propylcyclohexane
$$ \text { Identify the most stable carbocation from the following } $$




A metal crystallises in simple cubic lattice. The volume of one unit cell is $6.4 \times 10^7 \mathrm{pm}^3$. What is the radius of the metal atom in pm ?
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