JEE Main Chemistry question

A hydrocarbon has the formula CH. To find out whether it contains two double bonds (an allene) or a triple bond (an alkyne), the following test is performed:

(A)Passed through ammoniacal AgNOCorrect
(B)Treated with Baeyer's reagent
(C)Treated with Fehling's solution
(D)Treated with bromine water

Answer: (A)

Solution

A terminal alkyne (propyne, HCC–CH) has an acidic C–H and gives a precipitate with ammoniacal AgNO; an allene (propadiene, CH=C=CH) has only

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Question ID VK-142514