MCQ
Decreasing order towards $S_N I$ reaction for the following compounds is:


- Aa $>$ c $>$ d $>$ b
- Ba $>$ b $>$ c $>$ d
- Cb $>$ d $>$ c $>$ a
- Dd $>$ b $>$ c $>$ a

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Product $(A)$ is
The time taken for $A$ to become $1 / 4^{\text {th }}$ of its inital concentration is twice the time taken to become $1 / 2$ of the same. Also, when the change of concentration of $B$ is plotted against time, the resulting graph gives a straight line with a negative slope and a positive intercept on the concentration axis. The overall order of the reaction is . . . . .
$X_2O_4(g) \to 2XO_2(g)$
$\Delta U = 2.1\, kcal, \Delta S = 20\, cal\, K^{-1}$ at $300\, K$.
Hence $\Delta G$ is ....$kcal$