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$A\xrightarrow[(ii)\;H_3O^+]{(i)\;CH_3MgBr}B\xrightarrow[573\;K]{Cu}2-$methyl $2-$butene
The mass percentage of carbon in $A$ is
The increase in boiling point of solution in benzene in ${ }^{\circ} \mathrm{C}$ is $\mathrm{x} \times 10^{-2}$. The value of $\mathrm{x}$ is ..... .(Nearest integer)
$[$ Atomic mass : $\mathrm{C}=12.0, \mathrm{H}=1.0, \mathrm{O}=16.0]$
$Zn^{2+} + 2e^-$ $\longrightarrow$ $Zn (s) ; E^o = -0.76\,V$
$Ca^{2+} + 2e^-$ $\longrightarrow$ $Ca (s) ; E^o = -2.87\,V$
$Mg^{2+} + 2e^-$ $\longrightarrow$ $Mg (s) ; E^o = -2.36\,V$
$Ni^{2+} + 2e^-$ $\longrightarrow$ $Ni (s) ; E^o = -0.25\,V$
The reducing power of the metals increases in the order