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Three statements about halogens are given below: (P) The bond length order is F2 < Cl2 < Br2 < I2. (Q) The oxidising power order is F2 > Cl2 > Br2 > I2. (R) The correct order of bond dissociation energy is Cl2 > Br2 > F2 > I2. Which of the following is correct?

1. P and Q are correct
2. Q and R are correct
3. P and R are correct
4. P, Q and R are all correct

Correct answer: P and Q are correct

Solution

Bond length increases down the group (P correct). Oxidising power decreases down the group (Q correct). Standard BDE values: F2~159, Cl2~242, Br2~193, I2~151 kJ/mol, giving Cl2>Br2>F2>I2, so R is also correct. Hence all three are correct.

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