Consider the following reaction:
$C_{2} H_{5} O K + C_{6} H_{5} O H ⇌ C_{2} H_{5} O H + C_{6} H_{5} O K$
Which of the following is true about the above reaction?

It is an endothermic reaction

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The equilibrium favors products

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The equilibrium favours rectants

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If phenol is substituted by p-chlorophenol, reaction will be more exothermic

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Solution

The correct options are
B The equilibrium favors products
D If phenol is substituted by p-chlorophenol, reaction will be more exothermic
During the reaction between an acid and a base, a weaker acid and a weaker base are obtained.
Phenol is more acidic than ethanol. Similarly, phenoxide ion is less basic than ethoxide ion.
Hence, during the reaction $C_{2} H_{5} O K + C_{6} H_{5} O H ⇌ C_{2} H_{5} O H + C_{6} H_{5} O K$ the equilibrium will favor the products which contain a weak acid (ethanol) and a weak base (potassium phenoxide).
When phenol is substituted by p-chlorophenol, due to electron withdrawing effect of chlorine, the acidity increases.
Hence, during neutralization reaction, more energy is released.

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