객관식
What is the major product obtained when 2-bromopropane reacts with aqueous under reflux conditions?
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3. Acids and Bases
Organic Chemistry Reactions
객관식
Which of the following reagents can be used to convert into a ?
A
followed by
B
with Lindlar's catalyst
C
followed by and
D
and
검증된 단계별 안내1
Identify the structure of 1-pentyne: it is a terminal alkyne with the triple bond between the first and second carbon atoms.
Recall that converting a terminal alkyne to a ketone typically involves hydration of the alkyne, which adds water across the triple bond to form an enol intermediate that tautomerizes to a ketone.
Understand that the reagent combination \( \mathrm{HgSO_4} \) and \( \mathrm{H_2SO_4} \) catalyzes the acid-catalyzed hydration of terminal alkynes, leading to Markovnikov addition of water and formation of a methyl ketone after tautomerization.
Evaluate the other reagents: \( \mathrm{NaNH_2} \) followed by \( \mathrm{CH_3Br} \) is used for alkylation of alkynes, not hydration; \( \mathrm{H_2} \) with Lindlar's catalyst selectively hydrogenates alkynes to cis-alkenes; \( \mathrm{O_3} \) followed by \( \mathrm{Zn} \) and \( \mathrm{H_2O} \) is used for ozonolysis, which cleaves double or triple bonds rather than forming ketones directly.
Therefore, the correct reagent to convert 1-pentyne into a ketone is the mercuric sulfate and sulfuric acid combination, which performs the acid-catalyzed hydration of the terminal alkyne.
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