JAMB Chemistry 2020 Objective — Question 40

Question 40 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.

40. Which of the following will give a precipitate with an aqueous ammoniacal solution of copper (I) chloride?

A. A. CH3C≡CCH3
B. B. CH≡CHCorrect
C. C. CH3CH2C≡CCH2CH3
D. D. CH3C≡C(CH2)3CH3

Explanation

Ammoniacal copper(I) chloride gives a precipitate with terminal alkynes (those with a C≡C-H bond), such as ethyne (CH≡CH). Internal alkynes (with no terminal hydrogen on the triple bond) do not give this test.

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