A hydrocarbon decolourizes `KMnO_4` solution but does not form any precipitate with either ammoniacal `AgNO_3 or Cu_2Cl_2`.
Does the hydrocarbon belong to alkane, alkene or alkyne family?

Explanation

To determine whether the hydrocarbon belongs to the alkane, alkene, or alkyne family based on its reactions, we can follow these steps:

### Step 1: Analyze the Reaction with KMnO4
- The hydrocarbon decolorizes KMnO4 solution. This indicates that it is likely to be an unsaturated hydrocarbon.
- In organic chemistry, KMnO4 is known as a Baeyer’s reagent, which is used to test for the presence of double or triple bonds.

### Step 2: Determine the Implications of Decolorization
- If the hydrocarbon were an alkane, it would not react with KMnO4, and thus, there would be no color change.
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