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Question
Which of the following has the most negative heat of hydrogenation?
Which of the following has the most negative heat of hydrogenation?
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Solution
The correct option is A
Calculating number of alpha hydrogens in each case:
(a) has 1 alpha hydrogen
(b) has 4 alpha hydrogens.
(c) has 10 alpha hydrogens.
(d) has 7 alpha hydrogens.
Since alkene (a) has the least number of alpha hydrogens, it is the least stable alkene of the all.
Lesser is the stability, more negative is the heat of hydrogenation.
So, option A is correct.
Calculating number of alpha hydrogens in each case:
(a) has 1 alpha hydrogen
(b) has 4 alpha hydrogens.
(c) has 10 alpha hydrogens.
(d) has 7 alpha hydrogens.
Since alkene (a) has the least number of alpha hydrogens, it is the least stable alkene of the all.
Lesser is the stability, more negative is the heat of hydrogenation.
So, option A is correct.
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