(B) The reaction is $RCl + H_2O \longrightarrow ROH + HCl$. Since water is present in large excess,its concentration remains effectively constant duri

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Molecularity is $2$ but order of reaction is $1$

(B) The reaction is $RCl + H_2O \longrightarrow ROH + HCl$. Since water is present in large excess,its concentration remains effectively constant during the reaction. Therefore,the rate law is given by $Rate = k[RCl]^1[H_2O]^0 = k'[RCl]^1$. The order of the reaction is the sum of the powers of the concentration terms in the rate law,which is $1 + 0 = 1$. The molecularity is the number of reacting species taking part in an elementary step,which is $2$ ($RCl$ and $H_2O$). Thus,molecularity is $2$ and order is $1$.

Class 12 Chemistry Chemical Kinetics Rate law , Rate constant , Order of Reaction and Molecularity

Medium

In the hydrolysis of an organic chloride in the presence of a large excess of water,the reaction is $RCl + H_2O \longrightarrow ROH + HCl$. Determine the molecularity and order of the reaction.

A
Molecularity and order of reaction both are $2$
B
Molecularity is $2$ but order of reaction is $1$
C
Molecularity is $1$ but order of reaction is $2$
D
Molecularity and order of reaction both are $1$

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Chemical Kinetics

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Rate law , Rate constant , Order of Reaction and Molecularity

The rate constant value for a reaction is $1.75 \times 10^2 \ L^2 \ mol^{-2} \ sec^{-1}$. The half-life period $t_{1/2} \propto$ . . . . . . .

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Mechanism of a hypothetical reaction $X_2 + Y_2 \rightarrow 2XY$ is given below:
$(i)$ $X_2 \rightarrow X + X$ (fast)
$(ii)$ $X + Y_2 \rightleftharpoons XY + Y$ (slow)
$(iii)$ $X + Y \rightarrow XY$ (fast)
The overall order of the reaction will be

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What is the relationship between the half-life period $(t_{1/2})$ and the initial concentration $([R]_0)$ for a reaction of order $n$?

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What is the time taken for the $3^{rd}$ half-life of a second-order decomposition reaction,given that its first half-life is $20 \ s$ (in $s$)?

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For the reaction ${H_{2(g)} + I_{2(g)} \to 2HI_{(g)}}$,the possible mechanism is given below:
$I_2 \underset{k_{-1}}{\stackrel{k_1}{\rightleftharpoons}} 2 I$ (fast step)
${2I + H_2 \xrightarrow{K_2} 2HI}$ (slow step)
Determine the rate law for the reaction.

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In the hydrolysis of an organic chloride in the presence of a large excess of water,the reaction is $RCl + H_2O \longrightarrow ROH + HCl$. Determine the molecularity and order of the reaction.

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Mechanism of a hypothetical reaction $X_2 + Y_2 \rightarrow 2XY$ is given below:
$(i)$ $X_2 \rightarrow X + X$ (fast)
$(ii)$ $X + Y_2 \rightleftharpoons XY + Y$ (slow)
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The overall order of the reaction will be

For the reaction ${H_{2(g)} + I_{2(g)} \to 2HI_{(g)}}$,the possible mechanism is given below:
$I_2 \underset{k_{-1}}{\stackrel{k_1}{\rightleftharpoons}} 2 I$ (fast step)
${2I + H_2 \xrightarrow{K_2} 2HI}$ (slow step)
Determine the rate law for the reaction.