Which one among the following gives a dicarbonyl compound with O_(3) followed by reduction with zinc and water

Which one among the following gives a dicarbonyl compound with O_(3) f

1.	Which one among the following gives a dicarbonyl compound with O_(3) followed by reduction with zinc and water
Answer» `C_(2)H_(4)` `C_(6)H_(6)` `C_(2)H_(2)` Both 2 & 3 Answer :D