The Chlorine (greenish yellow) also gets decoloursied due the addition of its atoms on the double bond.
Note: Alkenes react with and decolourise halogens and potassium permanganate by additional reaction at room temperature and pressure.
The reaction site is the double bond and hence/all alkenes will react in a similar manner.
Kavungya answered the question on April 27, 2019 at 12:17
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