Complete and balance the following equations. If no reaction...

Complete and balance the following equations. If no reaction occurs, write $\mathrm{NR}$. (a) $\mathrm{Cl}_{2}(g)+\mathrm{Br}^{-}(a q) \longrightarrow$ (b) $\mathrm{I}_{2}(s)+\mathrm{Cl}^{-}(a q) \longrightarrow$ (c) $\mathrm{I}_{2}(s)+\mathrm{Br}^{-}(a q) \longrightarrow$ (d) $\mathrm{Br}_{2}(l)+\mathrm{Cl}^{-}(a q) \longrightarrow$

Complete and balance the following equations. If no reaction occurs, write $\mathrm{NR}$.
(a) $\mathrm{Cl}_{2}(g)+\mathrm{Br}^{-}(a q) \longrightarrow$
(b) $\mathrm{I}_{2}(s)+\mathrm{Cl}^{-}(a q) \longrightarrow$
(c) $\mathrm{I}_{2}(s)+\mathrm{Br}^{-}(a q) \longrightarrow$
(d) $\mathrm{Br}_{2}(l)+\mathrm{Cl}^{-}(a q) \longrightarrow$

Key Concepts

Halogen Displacement Reactions

Halogen displacement reactions involve the substitution of a halide ion in a compound by another halogen element. In these reactions, the more reactive halogen, in its elemental form, oxidizes the less reactive halide ion to form the diatomic halogen, while the elemental halogen itself is reduced to a halide ion. This concept is a specific example of an oxidation-reduction (redox) process where electron transfer determines whether the reaction proceeds.

Activity Series of Halogens

The activity series of halogens is a ranking of the halogens according to their relative reactivity, particularly their ability to act as oxidizing agents. The series typically places chlorine as more reactive than bromine, and bromine as more reactive than iodine. Understanding this series is essential because it predicts the feasibility of displacement reactions: a halogen will only displace another if it is higher in the activity series.

Balancing Redox Reactions

Balancing redox reactions requires ensuring that both mass and charge are conserved during the process. This often involves dividing the overall reaction into separate oxidation and reduction half-reactions, balancing each for atoms and charge, and then combining them to form the complete balanced equation. This systematic approach is critical when dealing with electron transfer processes such as those in halogen displacement reactions.

Reaction Feasibility and Non-occurrence (NR)

In some cases, the predicted halogen displacement reaction may not occur if the reacting halogen is not sufficiently reactive to displace the halide ion in solution. This is determined by comparing their positions in the activity series; if the provided elemental halogen is lower in the series compared to the halide ion, the reaction will not proceed, and it is denoted as 'NR' (no reaction).

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