Which of the following cannot be represented by resonance structu…

${C_6}{H_5} - H\mathop {\xrightarrow{{[X]}}}\limits_{AlC{l_3}} $ $\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{C}_{6}}{{H}_{5}}-C-C{{H}_{2}}-{{C}_{6}}{{H}_{5}} \\
\end{matrix}$

$[X]$ will be :

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The enthalpies of combustion of $S(s)$ and $H_2(g)$ are $ -300$ and $-290\,\, kcal\,\, mol^{-1.}$

Given $SO_3(g) + H_2O(l) \rightarrow H_2SO_4(l)$
$\Delta H = -130\,\, kcal\, mol^{-1}$
$SO_2(g) + 1/2O_2(g) \rightarrow SO_3(g)$
$\Delta H = -100 \,\,kcal\,\, mol^{-1}$
the enthalpy of formation of $H_2SO_4(l)$ would be ......$kcal\, mol^{-1}$

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The stereoisomers that are formed by electrophilic addition of bromine to trans$-$but$-2-$ene is/are:

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Boric acid is acid because its molecule:

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Which of the following is the strongest Bronsted base ?

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Which one of the following is correct order of electron gain enthalpy?

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Pyrolysis of ethyl acetate gives :

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Rearrange the following in the increasing order of acidic strength.
$(i)$ benzoic acid $(ii)\, p$ -methoxybenzoic acid $(iii)\, o$ -methyoxybenzoic acid