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Iodine forms I3^(-) but F2 does not for...

Iodine forms` I_3^(-)` but `F_2` does not form `F_(3)^(-)` ions. Why?

A

`CO_2,CH_3CHO` and `C_2H_6`

B

`CO_2`,`CH_3COOH` and `C_2H_6`

C

`CO_2`,`HCHO` and `CH_4`

D

`CH_3CHO`,`HCHO` and `C_2H_6`

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