In which of the following hydrocarbons would give a red precipitate on treatment with ammoniacal cuprous chloride

Acetylene reacts with ammoniacal cuprous chloride to from :

How many of the following molecule can give red precipitate when treated with ammnonical cuprous chloride. Propyne, Butyne-1, Butyne-2, Acetylene, pentyne-1, Pentyne-2 and Phenyl acetylene.

A dihalogen derivative (A) of a hydrocarbon having two carbon atoms reacts with alcoholic potash and forms another hydrocarbon which gives a red precipitate with ammoniacal cuprous chloride. Compound A gives an aldehyde when treated with aqueous KOH. Write down the name and formula for the organic compound.

A dihalogen derivative (A) of a hydrocarbon having two carbon atoms reacts with alcoholic potash and forms another hydrocarbon which gives a red precipitate with ammoniacal cuprous chloride. Compound A gives an aldehyde when treated with aqueous KOH. Write down the name and formula for the organic compound.

The hydrocarbon that reacts with ammonical cuprous chloride is-