Question
Relation between $(A)$ and $(B)$ is



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$(I)$ $C{H_2} = CH\mathop C\limits^ + HC{H_3}$
$\begin{array}{*{20}{c}} {{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}} \\ {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,} \\ {(II)\,\,\,\,\,\,\,\,\,\,C{H_2} = C - \mathop {{\text{ }}C}\limits^ + {H_2}} \end{array}$
$(III)$ $C{H_3}CH = CH\mathop C\limits^ + {H_2}$

$(b)$ Tertiary alcohol $\xrightarrow[\Delta ]{{{H_3}P{O_4}}}$
For above dehydration reaction rate of reaction will be
Calculate $\Delta {T_b}$ if ${K_f} = 1.86$ and ${K_b} = 0.521$.