Cl2 Br2 or I2

explain?

Chlorine has the lowest boiling point as compared to other two (bromine and iodine) because Br and I is larger than Cl, therefore Br2 AND I2 has stronger intermolecular foces (Van der Waals) compared to Cl2. Among Br2 and I2 , Bromine has lower boiling point as compared to iodine ( same reason)

Hope , this helped you.

Boiling point of Cl₂ is lowest i.e 239.11 K , then of Br₂=332K and of I₂ = 457.40K

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Cl2: -34°C
Br2: 59.5°C

I2: 185.2°C.

You can see that the boiling point is increasing down the group.

Cl2 has lowest boiling point