When attached to $sp^3$ -hybridized carbon, their leaving group ability in nucleophilic substitution reaction decreases in the order
$I$ is best leaving group due to electron withdrawing ($-I$) effect of trifluoromethyl group and delocalization of negative charge over $3 O$ atoms.
$III$ is worst leaving group because negative charge is delocalized over $C$ atoms.
The stabilization effect of resonance for the anion in which negative charge is delocalized over $O$ atoms is more pronounced over the delocalization in which the negative charge is delocalized over $C$ atoms.
$II$ is better leaving group than $IV$ because in $II$, the extent of delocalisation of negative charge is much more than the extent of delocalization in $IV$ .
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$\mathrm{E}_{\mathrm{n}}=$ Total energy, $\mathrm{K}_{\mathrm{n}}=$ Kinetic energy, $\mathrm{V}_{\mathrm{n}}=$ Potential energy , $\mathrm{r}_{\mathrm{n}}=$ Radius of $\mathrm{n}^{\text {th }}$ orbit
Match the following:
| Column $I$ | Column $II$ |
| $(A)$ $\mathrm{V}_{\mathrm{n}} / \mathrm{K}_{\mathrm{n}}=$ ? | $(P)$ $0$ |
| $(B)$ If radius of $n^{\text {th }}$ orbit $\propto E_n^x, x=$ ? | $(Q)$ $-1$ |
| $(C)$ Angular momentum in lowest orbital | $(R)$ $-2$ |
| $(D)$ $\frac{1}{\mathrm{r}^{\mathrm{n}}} \propto \mathrm{Z}^{\mathrm{y}}, \mathrm{y}=$ ? | $(S)$ $1$ |
$C{O_{\left( g \right)}} + \frac{1}{2}{O_{2\left( g \right)}} \to C{O_{2\left( g \right)}}\,;\,\Delta H = - 300\,kJ$
${H_2}_{\left( g \right)} + \frac{1}{2}{O_2}_{\left( g \right)} \to {H_2}{O_{\left( g \right)}}\,;\,\Delta H = - 250\,kJ$
$C_{(s)} + O_{2(g)} \to CO_{2(g)} ; \Delta H = -x\, kJ$
The value of $x$ will be