Chapter 9, Problem 2STP

Interpretation Introduction

Interpretation:

To predict the reaction that will occur between halogens and halide salts.

Concept introduction:

The halogens are placed on the left of the noble gases on the periodic table. They are comprises of total of 5 elements. The reactivity of halogen is as follows:

$\text{Fluorine>chlorine>bromine>iodine}$

In displacement reactions, a more reactive halogen displaces less reactive halogens in a compound.

Answer to Problem 2STP

The reaction which is given in option A occurs.

Explanation of Solution

Reason for correct option:

The reaction given in the option A is as follows:

${\text{F}}_{\text{2}}\left(\text{g}\right){\text{+FeI}}_{\text{2}}\left(\text{aq}\right)\to {\text{FeF}}_{\text{2}}\left(\text{aq}\right){\text{+I}}_{\text{2}}\left(\text{l}\right)$

In this reaction, fluorine displaces iodine because fluorine is the most reactive halogens than iodine. So, it replaces iodine.

Conclusion

Reason for incorrect option:

The reaction given in option B, C, and D will not occur. Because in option B, iodine is less reactive than bromine. So, it does not displace bromine in a compound from its position.

In option C, chlorine is less reactive than fluorine. So, it does not displace fluorine in a compound from its position.

In option D, bromine is less reactive than chlorine. So, it does not displace chlorine in a compound from its position.