Arrange the following in the increasing order of their heat of hydrogenation- P lt-Q lt-R lt-SS lt-R lt-P lt-QS lt-R lt-Q lt-PP lt-Q lt-S lt-R

The correct option is A P lt;Q lt;R lt;SHeat of hydrogenation∝1/stability of alkene The stability of alkenes depends upon two major factors: i) Conjugat ...

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Standard XII

Chemistry

Catalytic Hydrogenation

Arrange the f...

Question

Arrange the following in the increasing order of their heat of hydrogenation:

P < Q < R < S

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S < R < Q < P

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S < R < P < Q

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P < Q < S < R

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Solution

The correct option is A $P < Q < R < S$
$Heat of hydrogenation \propto \frac{1}{stability of alkene}$

The stability of alkenes depends upon two major factors:
i) Conjugation
ii) Number of $α -$ hygrogens

(P) being most stable has least heat of hydrogenation since the double bond is in conjugation.

Among (Q), (R) and (S), the number of $α -$ hygrogens are in the order: $Q > R > S$

Hence, the heat of hydrogenation follows the trend: $P < Q < R < S$

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