Observe the following statements
Statement I The carbon containing components of photochemical smog are acrolein, methanal and PAN. Statement II The number of greenhouse gases in the list given below is 5 .
$$ \mathrm{CH}_4, \mathrm{CO}_2, \mathrm{NO}, \mathrm{H}_2 \mathrm{O}(l), \mathrm{H}_2 \mathrm{O}(g), \mathrm{O}_2, \mathrm{O}_3 $$
The correct answer is
The condensed, bond line and complete formulae of $n$-butane are respectively.

' $X$ ' is the isomer of $\mathrm{C}_6 \mathrm{H}_{14}$. It has four primary carbons and two tertiary carbons, ' $X$ ' can be prepared from which of the following reactions?
$$ \text { What are } X \text { and } Y \text { in the following reaction sequence? } $$
$$ \text { Isopentane } \xrightarrow{\mathrm{KMnO}_4} X \xrightarrow[358 \mathrm{~K}]{20 \% \mathrm{H}_3 \mathrm{PO}_4} Y $$
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