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Introduction

Decreasing or...

Question

Decreasing order of heat evolved upon catalytic hydrogenation of given reactants with $H_{2}$ (Pd/C) is:

b > c > a > d

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d > a > c > b

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d > c > a > b

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a > b > c > d

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Solution

The correct option is B d > a > c > b
As refer to the above image least stable – more heat of hydrogenation. So, Order of heat evolved is - $d > a > a > b$

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