- A4-Ethyl-3,4-dimethyloctane
- B2,2,4,4-Tetramethylhexane
- ✓2,2,3,3-Tetramethylpentane
- D2,2,4,5-Tetramethylheptane

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$A$, (molecular formula $\left.\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{2}\right)$ with a straight chain structure gives a $C_{4}$ carboxylic acid. $A$ is :
$A \frac{{Li} {A} {H} {H}_{4}}{{H}_{3} {O}^{+}} \longrightarrow B \stackrel{\text { Oxidation }}{\longrightarrow} {C}_{4}-$ carboxylic acid
| List $I$ (Fuels) | List $II$ (Composition) |
| $A.$ Water gas | $i.$ A mixture of $CO$ and $N_2$ |
| $B.$ Producer gas | $ii.$ Methane |
| $C.$ Coal gas | $iii.$ A mixture of $CO$ and $H_2$ |
| $D.$ Natural gas | $iv.$ A mixture of $CO$, $H_2$, $CH_4$ and $CO_2$ |
$A\,-\,B\,-\,C\,-\,D$ Respectively
${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{ - 4}}\xrightarrow{{MnO_4^ - /{H^ + }}}F{e^{ + 3}} + C{O_2} + NO_3^ - $
$Pt$ $\mid H _{2}$ $(g,1 \,bar)$ $\left| H ^{+}( aq ) \| Cu ^{2+}( aq )\right| Cu ( s )$
is $0.31\, V$. The $pH$ of the acidic solution is found to be $3 ,$ whereas the concentration of $Cu ^{2+}$ is $10^{- x } \,M$. The value of $x$ is $.....$
(Given: $E _{ Cu ^{2+} / Cu }^{\ominus}=0.34 \,V$ and $\frac{2.303 RT }{ F }=0.06\, V$ )