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Which of the following has the smallest heat of hydrogenation per mole?
- a)1-Butene
- b)trans-2-Butene
- c)cis-2-Butene
- d)1,3-Butadiene
Correct answer is option 'D'. Can you explain this answer?
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Which of the following has the smallest heat of hydrogenation per mole...
Conjugated double bond being most stable has the least heat of hydrogenation
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Which of the following has the smallest heat of hydrogenation per mole...
1,3-Butadiene has the smallest heat of hydrogenation per mole:
1. Explanation:
1,3-Butadiene has the smallest heat of hydrogenation per mole because it is the most stable among the given compounds.
- In 1,3-Butadiene, the two double bonds are conjugated, which leads to resonance stabilization. This results in a lower energy requirement for the addition of hydrogen.
- The conjugation in 1,3-Butadiene allows for delocalization of electrons, making the molecule more stable compared to the other compounds.
2. Differences with other compounds:
- 1-Butene has one double bond, which requires less energy to hydrogenate compared to multiple double bonds. However, it is not as stable as 1,3-Butadiene due to lack of conjugation.
- trans-2-Butene and cis-2-Butene have one double bond like 1-Butene, but they also lack the conjugation present in 1,3-Butadiene, making them less stable and requiring more energy for hydrogenation.
3. Comparing with all compounds:
- Overall, 1,3-Butadiene has the smallest heat of hydrogenation per mole among the given compounds due to its conjugated system and increased stability.
In conclusion, 1,3-Butadiene has the smallest heat of hydrogenation per mole because of its conjugated double bonds and resonance stabilization, making it more stable and requiring less energy for hydrogenation compared to the other compounds.
1. Explanation:
1,3-Butadiene has the smallest heat of hydrogenation per mole because it is the most stable among the given compounds.
- In 1,3-Butadiene, the two double bonds are conjugated, which leads to resonance stabilization. This results in a lower energy requirement for the addition of hydrogen.
- The conjugation in 1,3-Butadiene allows for delocalization of electrons, making the molecule more stable compared to the other compounds.
2. Differences with other compounds:
- 1-Butene has one double bond, which requires less energy to hydrogenate compared to multiple double bonds. However, it is not as stable as 1,3-Butadiene due to lack of conjugation.
- trans-2-Butene and cis-2-Butene have one double bond like 1-Butene, but they also lack the conjugation present in 1,3-Butadiene, making them less stable and requiring more energy for hydrogenation.
3. Comparing with all compounds:
- Overall, 1,3-Butadiene has the smallest heat of hydrogenation per mole among the given compounds due to its conjugated system and increased stability.
In conclusion, 1,3-Butadiene has the smallest heat of hydrogenation per mole because of its conjugated double bonds and resonance stabilization, making it more stable and requiring less energy for hydrogenation compared to the other compounds.
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Which of the following has the smallest heat of hydrogenation per mole?a) 1-Butene b) trans-2-Butene c) cis-2-Butene d) 1,3-Butadiene Correct answer is option 'D'. Can you explain this answer?
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