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Explain the reactivity of group 13 elements towards halogens.

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Explain the reactivity of group 13 elements towards halogens.

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i. All the elements of group 13 react directly with halogens to form trihalides (EX3).

2E(s) + 3X2(g) → 2EX3(s)  (where, E = B, Al, Ga, In and X = F, Cl, Br, I)

ii. Thallium is an exception as it forms monohalides (TlX).

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