Which one of the following alkenes will react fastest with H2 under catalytic hydrogenation condition?
Correct answer: A. 1-Butene
- A. 1-Butene
- B. 2-Methylpropene
- C. 2,3-Dimethyl-2-butene
- D. 2,3-Dimethyl-1-butene
Explanation
The reactivity of alkenes in catalytic hydrogenation is influenced by steric hindrance, with alkenes having less hindrance reacting faster. In this case, 1-Butene reacts the fastest due to its terminal double bond providing the least steric hindrance. 2-Methylpropene is slower due to increased hindrance from alkyl groups on the same carbon. 2,3-Dimethyl-2-butene and 2,3-Dimethyl-1-butene exhibit even more hindrance from greater substitution, resulting in slower reactions compared to 1-butene.
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About Chemistry of Hydrocarbons
Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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