Consider the reaction sequence given below :

Which of the following statement is true

Changing the concentration of the base will have no effect on reaction (1)

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Changing the base from

O H^{-}

^{-} O R

will have no effect on reaction (2)

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Doubling the concentration of base will double the rate of both the reaction .

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Changing the concentration of the base will have no effect on reaction (2)

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Solution

The correct option is A Changing the concentration of the base will have no effect on reaction (1)
Reaction (1) is $S_{N} 1$ reaction because its rate depend only on the concentration of substrate.
Increasing or decreasing the concentration of nucleophile in reaction (1) does not alter the rate of reaction.

Reaction (2) is $E 2$ elimination reaction because its rate depend on both substrate and base used.

Changing the base or changing the concentration of base will affect the rate of reaction.
Hence, option (a) is correct.

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W_{2}, X_{2}, Y_{2}

Z_{2}

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2 W^{-} + Y_{2} \to

2 Z^{-} + X_{2} \to 2 X^{-} + Z_{2}

F e C r_{2} O_{4} + N a_{2} C O_{3} + O_{2} F u s i o n - --- \to [X] H^{+} - - \to H_{2} O [Y] H^{+} - - \to H_{2} O_{2} [Z]

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