- AAccelerate biochemical reactions
- BHave optimum activity at body temperature
- CConsist of amino acids
- ✓Have all these properties
$(i)$ Are proteins that catalyze the biochemical reactions
$(ii)$ They consist of amino acids.
$(iii)$ Have optimum activity at body temperature.
Therefore, optimal temperature is usually around human body temperature $\left(37.5^{\circ} C \right)$
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$ 3 \mathrm{ROH}+\mathrm{PCl}_3 \rightarrow 3 \mathrm{RCl}+\mathrm{A} $
$ \mathrm{ROH}+\mathrm{PCl}_5 \rightarrow \mathrm{RCl}+\mathrm{HCl}+\mathrm{B}$
$\mathop {C{H_3} - \mathop C\limits^ \oplus H - C{H_3}}\limits_I $
$\mathop {C{H_3} - \mathop C\limits^ \oplus H - OC{H_3}}\limits_{II} $
$\mathop {C{H_3} - \mathop C\limits^ \oplus H - C{H_2} - OC{H_3}}\limits_{III} $

$N _2 O _3, N _2 O _5, P _4 O _6, P _4 { O }_7, H _4 P _2 O _5, H _5 P _3 O _{10}, H _2 S _2 O _3, H _2 S _2 O _5$
$\ln k=33.24-\frac{2.0 \times 10^{4} \,K }{ T }$
The Activation energy for the reaction is given by $...\,k\,\,J mol ^{-1}$. (In Nearest integer)
(Given: $R =8.3\, J\, K ^{-1} \,mol ^{-1}$ )