MCQ
$o-$ Toluic acid on reaction with $B{r_2} + Fe$ gives
  • A

  • B


  • D

Answer

Correct option: C.

c
(c) $ - \,COOH$ is meta directing group
 

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......$m$ sodium acetate should be added to a $0.1\,\,m$ solution of $C{H_3}COOH$ to give a solution of $pH = 5.5\,(p{K_a}$ of $C{H_3}COOH = 4.5)$
$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,C{H_3}}\\
{\,|\,\,}\\
{C{H_3} - C - N{H_2}}\\
|\\
{\,\,\,\,\,\,\,\,C{H_3}}
\end{array}$ $\xrightarrow{{NaN{O_2} + HCl}}$ Product

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The standard Gibbs energy change at 300 K for the reaction $2 A= B + C$ is 2494.2 J . At a given time, the composition of the reaction mixture is $[A]=1 / 2,[B]=2$ and $[C]=1 / 2$. The reaction proceeds in the $[R=8.314 J / K / mol , e =2.718]$
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Which of the following compound is differentiated by $NaHCO_3$ as well as by  $NaOH$ ?
Given below are two statements

Statement $I :$ The $E ^{\circ}$ value of $Ce ^{4+} / Ce ^{3+}$ is $+1.74 \,V$

Statement $II :$ $Ce$ is more stable in $Ce ^{4+}$ state than $Ce ^{3+}$ state.

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The number of moles of sodium sulphite $(Na_2SO_3)$ needed to react with one mole of $KMnO_4$ in acidic solution
Calculate the $\Delta _fH^o$ of $N_2H_4(g)$ if

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$B.E(N -H) = 398\, kJ\, mol^{-1}\, .......\,kJ\, mol^{-1}$

The most stable hydride is