The major products $P$ and $Q$ in the following reaction sequences are

$$ \text { Identify the correct decreasing order of acidic strength. } $$

$$ \text { Identify } X \text { in the following. } $$

If $f:[-3,2] \rightarrow[0, \sqrt[3]{x}]$ is an onto function defined by $f(n)=\left\{\begin{array}{cc}2+\sqrt[3]{n}, & -3 \leq n \leq-1 \\ n^{2 / 3}, & -1 \leq n \leq 2\end{array}\right.$, then $x=$