1
Question
Assertion :Heat of hydrogenation of 1−butene is more than 2−butene. Reason: With 6−αH 2−butene is more stable than 1−butene with only 2−αH.
Assertion :Heat of hydrogenation of 1−butene is more than 2−butene. Reason: With 6−αH 2−butene is more stable than 1−butene with only 2−αH.
Open in App
Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Heat of hydrogenation is the amount of heat required to break C=C bond for addition of Hydrogen, to convert it into an alkene.
More stable the alkene, more heat is required to break the double bond.Alkene with more α− hydrogen are most stable.but−2−ene has 6α−H & but−1−ene has 2α−H. Thus but−2−ene is more stable than but−1−ene. Thus but−2−ene will have lower energy than but−1−ene.(Refer to Image)By the energy diagram we can see that to convert alkene to alkane more energy is required in case of but−1−ene.Thus Assertion is correct and Reason is the correct explanation of Assertion.
Heat of hydrogenation is the amount of heat required to break C=C bond for addition of Hydrogen, to convert it into an alkene.
More stable the alkene, more heat is required to break the double bond.
Alkene with more α− hydrogen are most stable.
but−2−ene has 6α−H & but−1−ene has 2α−H. Thus but−2−ene is more stable than but−1−ene. Thus but−2−ene will have lower energy than but−1−ene.
(Refer to Image)
By the energy diagram we can see that to convert alkene to alkane more energy is required in case of but−1−ene.
Thus Assertion is correct and Reason is the correct explanation of Assertion.
Suggest Corrections
0
Similar questions
View More
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
