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Which of the following has the smallest heat of hy
drogenation per mole?
a)1-Butene
b)trans-2-Butene
c)cis-2-Butene
d)1,3-Butadiene
Correct answer is option 'B'. Can you explain this answer?
a)1-Butene
b)trans-2-Butene
c)cis-2-Butene
d)1,3-Butadiene
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Which of the following has the smallest heat of hy... moredrogenation ...
We know that higher stability,lower is the heat of hydrogenation.Butene-2 is more stable than butene-1 because the double bond present in butene-2 is in the centre of the molecule(CH3CH=CHCH3).Moreover trans-2 butene is more stable than cis-2-butene and thus its (i.e) trans-2-butene,heat of hydrogenation per mole will be less.
Values of heats of hydrogenation are listed here:
CH3CH2CH=CH2;CH3CH=CHCH3;CH2=CH−CH=CH2
Trans-2-butene is more stable than cis-2-butene because in trans-2-butene the bulky groups are far apart whereas in cis-2-butene the bulky groups are crowded together.Due to this cis-isomer has more vander walls strain than trans-isomer and thus cis-isomer is less stable.
Hence (b) is the correct answer.
Most Upvoted Answer
Which of the following has the smallest heat of hy... moredrogenation ...
Because the in trans-isomerism the molecules or elements are attached to same carbon
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Community Answer
Which of the following has the smallest heat of hy... moredrogenation ...
trans-2-Butene has the smallest heat of hydrogenation per mole.
- Explanation:
Trans-2-Butene has the smallest heat of hydrogenation per mole among the given options because it is the most stable alkene due to its trans configuration. The trans configuration results in less steric hindrance between the two alkyl groups, allowing the hydrogen to add more easily and with less energy. As a result, trans-2-Butene requires the least amount of energy to undergo hydrogenation compared to the other options.
On the other hand, cis-2-Butene has a higher heat of hydrogenation due to the presence of cis configuration, which results in more steric hindrance between the alkyl groups. This makes the addition of hydrogen more difficult and requires more energy.
In the case of 1-Butene and 1,3-Butadiene, they have higher heats of hydrogenation compared to trans-2-Butene because of their respective structures and the degree of unsaturation. The presence of a double bond in these compounds results in higher reactivity towards hydrogenation, leading to higher heat of hydrogenation values.
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Which of the following has the smallest heat of hy... moredrogenation per mole?a)1-Buteneb)trans-2-Butenec)cis-2-Butened)1,3-ButadieneCorrect answer is option 'B'. Can you explain this answer?
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