$$ \text { What are } x \text { and } y \text { in the following reaction sequence? } $$

$\mathrm{H}_2 \mathrm{O} / \mathrm{H}_2 \mathrm{SO}_4 ; \mathrm{KMnO}_4 / \mathrm{H}^{+}$
$\mathrm{H}_2 \mathrm{O} / \mathrm{H}_2 \mathrm{SO}_4 ; \mathrm{PCC}$
$\mathrm{H}_2 \mathrm{O} / \mathrm{H}_2 \mathrm{SO}_4, \mathrm{Hg}^{2+} ; \mathrm{KMnO}_4 / \mathrm{H}^{+}$
$\mathrm{H}_2 \mathrm{O} / \mathrm{H}_2 \mathrm{SO}_4, \mathrm{Hg}^{2+} ; \mathrm{PCC}$
Arrange the products I, II, III from the following reactions in decreasing order of their acid strength.

III $>$ II $>$ I
III $>$ I $>$ II
II $>$ I $>$ III
I $>$ II $>$ III
$$ \text { What are } x \text { and } y \text { in the following set of reactions? } $$





The domain and range of a real valued function $f(x)=\cos x-3$ are respectively
$R \backslash\{0\}$ and $[-1,1]$
$R$ and $[-1,1]$
$R \backslash\{0\}$ and $[-4,-2]$
$R$ and $[-4,-2]$
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