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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
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