JEE Main levelOne or more correct optionsDifficulty 2 of 3hc085
Which of the following give a precipitate with ammoniacal silver nitrate (or ammoniacal cuprous chloride)? Select all that apply.
A3-methylbut-1-yne, (CHX3)X2CH−C≡CH
Bbut-1-en-3-yne, CHX2=CH−C≡CH
Cpropyne, CHX3−C≡CH
Dbut-2-yne, CHX3−C≡C−CHX3
Answer: A, B, C
A precipitate needs a terminal C-H on a triple bond (R−C≡C−H). Propyne, 3-methylbut-1-yne and but-1-en-3-yne all have one. But-2-yne has no acidic hydrogen on an sp carbon, so it gives no precipitate.