Question Detail

CHM 102 Alkynes: Structure, Bonding, and Nomenclature Objective Question
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Question

What type of precipitate is formed when a terminal alkyne reacts with Cu₂Cl₂ in NH₄OH?
Options
A White precipitate (silver acetylide)
B Red precipitate (copper(I) acetylide)
Correct Answer
C Blue solution
D No reaction
Correct Answer

Option B is the correct answer.

Detailed Explanation

Terminal alkynes form insoluble copper(I) acetylides (red precipitate) with ammoniacal cuprous chloride (Cu₂Cl₂/NH₃).

Hint

Copper acetylides are red or reddish‑brown.

Question Info

Course: CHM 102
Topic: Alkynes: Structure, Bonding, and Nomenclature
Type: Objective
Difficulty: Not specified
Question 572 of 1999
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