Which of the following are examples of pseudo-unimolecular reactions?

C H_{3} C O_{2} C_{2} H_{5} + H_{2} O H^{+} - - \to C H_{3} C O_{2} H + C_{2} H_{5} O H

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C_{12} H_{22} O_{11} + H_{2} O H^{+} - - \to C_{6} H_{12} O_{6} (g l u c o s e) + C_{6} H_{12} O_{6}

(fructose)

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C H_{3} C O C l + H_{2} O \to C H_{3} C O_{2} H + H C l

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C H_{3} C O_{2} C_{2} H_{5} + H_{2} O O H^{-} - -- \to C H_{3} C O_{2} H + C_{2} H_{5} O H

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Solution

The correct options are
A $C H_{3} C O_{2} C_{2} H_{5} + H_{2} O H^{+} - - \to C H_{3} C O_{2} H + C_{2} H_{5} O H$
B $C_{12} H_{22} O_{11} + H_{2} O H^{+} - - \to C_{6} H_{12} O_{6} (g l u c o s e) + C_{6} H_{12} O_{6}$ (fructose)
C $C H_{3} C O C l + H_{2} O \to C H_{3} C O_{2} H + H C l$
$C_{12} H_{22} O_{11} + H_{2} O H^{+} - - \to C_{6} H_{12} O_{6} (glucose) + C_{6} H_{12} O_{6} (fructose)$

$C H_{3} C O_{2} C_{2} H_{5} + H_{2} O H^{+} - - \to C H_{3} C O_{2} H + C_{2} H_{5} O H$

$C H_{3} C O C l + H_{2} O \to C H_{3} C O_{2} H + H C l$

Here, since water is present in large excess, its concentration hardly changes during the course of the reaction. And as such, the rate depends only on the concentration of one reactant in this case. The order is one but the molecularity is two. Such reactions are called pseudo unimolecular reactions.

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C_{12} H_{22} O_{11} C a n e s u g a r + H_{2} O H^{+} - - \to C_{6} H_{12} O_{6} G l u c o s e + C_{6} H_{12} O_{6} F r u c t o s e

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