Conc. H_2SO_4 cannot be used to prepare HBr from NaBr because it

Experiment No.	$\begin{array}{c}{[ A ]} \\ \left( mol dm ^{-3}\right)\end{array}$	$\begin{array}{c}{[ B ]} \\ \left( mol dm ^{-3}\right)\end{array}$	$\begin{array}{c}{[ C]} \\ \left( mol dm ^{-3}\right)\end{array}$	Rate of reaction $\left( mol dm ^{-3} s ^{-1}\right)$
$1$	$0.2$	$0.1$	$0.1$	$6.0 \times 10^{-5}$
$2$	$0.2$	$0.2$	$0.1$	$6.0 \times 10^{-5}$
$3$	$0.2$	$0.1$	$0.2$	$1.2 \times 10^{-4}$
$4$	$0.3$	$0.1$	$0.1$	$9.0 \times 10^{-5}$

The rate of the reaction for $[ A ]=0.15 mol dm ^{-3},[ B ]=0.25 mol dm ^{-3}$ and $[ C ]=0.15 mol dm ^{-3}$ is found to be $Y \times 10^{-5} mol dm d ^{-3} s ^{-1}$. The value of $Y$ i. . . . . . .

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Identify the non reducing sugar

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The chemical name of vitamin C is:

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Which of the following compunds will not produce offensive smell when treated with $CHCl_3 / KOH$ ?

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$\begin{matrix}
O\,\,\,\,\,\, \\
||\,\,\,\,\,\, \\
R-C-N{{H}_{2}} \\
\end{matrix}$ $+xNaOH+B{{r}_{2}}\to $ $R-N{{H}_{2}}+2NaBr$ $+N{{a}_{2}}C{{O}_{3}}+{{H}_{2}}O$

Number of moles of $NaOH $ used in above Hoffmann bromamide reaction is

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${C_2}{H_5}CHO$ and ${(C{H_3})_2}CO$ can be distinguished by testing with

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