Which method is generally used to prepare alkynes?
Correct answer: A. Dehydrohalogenation of vicinal dihalide
- A. Dehydrohalogenation of vicinal dihalide
- B. Hydrogenation of alkene
- C. Hydrolysis
- D. Hydration of alkene
Explanation
Dehydrohalogenation is a reaction where a vicinal dihalide (a compound with two halogen atoms on adjacent carbon atoms) is converted into an alkyne. This is typically done using a strong base, such as potassium hydroxide (KOH), to remove two molecules of hydrogen halide (HX) and form a triple bond between the carbon atoms.The general reaction is:RCHX-CHXR' → R-C≡C-R' + 2HXThis method is commonly used to prepare alkynes because it allows for the formation of the triple bond with good yields and selectivity.
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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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