Question:
Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?(R=Alkyl substituent)
Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?(R=Alkyl substituent)
Updated On: Apr 21, 2025
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The Correct Option is A
Solution and Explanation
The hydrogens are transported from the catalyst to the same side of the double bond during catalytic hydrogenation, resulting in cis-alkenes. It stands to reason that the less R substituents there are, the less steric interference there is, and the faster the rate of hydrogenation.
Alkene stability is negatively correlated with alkene hydrogenation heat.
In the third compound, hydrogenation is catalytically accomplished. In the third compound more than any other compound, less energy is needed to break the double bond.
The alkene is more stable the more alkyl groups there are connected to the doubly bound carbon atoms. (Less aggressive)
Alkene stability is negatively correlated with alkene hydrogenation heat.
In the third compound, hydrogenation is catalytically accomplished. In the third compound more than any other compound, less energy is needed to break the double bond.
The alkene is more stable the more alkyl groups there are connected to the doubly bound carbon atoms. (Less aggressive)
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Concepts Used:
Alkenes
Alkenes
In organic chemistry, an alkene is a hydrocarbon containing a carbon-carbon double bond.[1]
Alkene is often used as synonym of olefin, that is, any hydrocarbon containing one or more double bonds.
Read More: Ozonolysis
IUPAC Nomenclature of Alkenes
- An alkene or cycloalkene is indicated by the suffix (ending) ene.
- For the root name, the longest chain must include both carbon atoms of the double bond.
- The root chain must be numbered beginning at the end closest to a double bond carbon atom. If the double bond is in the chain's centre, the nearest substituent rule is used to determine where the numbering begins.
- If the compound contains more than one double bond, it is named with a diene, triene, or equivalent prefix indicating the number of double bonds, and each double bond is assigned a locator number.
Read More: Unsaturated Hydrocarbon