Which one of the following is the correct order of increasing covalent character of halides of Al³⁺?

Question

Vimal Swarnkar · Accepted Answer

(a) AlF₃ < AlCl₃ < AlBr₃ < AlI₃. Same cation Al³⁺; larger, softer anion is more polarisable → more covalent. F⁻ < Cl⁻ < Br⁻ < I⁻ in size, so covalent character AlF₃ < AlCl₃ < AlBr₃ < AlI₃ → (a). AlF₃ is ionic (m.p. ~1290 °C); AlCl₃ sublimes.

Answer

(b) AlI₃ < AlBr₃ < AlCl₃ < AlF₃

Answer

(c) AlF₃ < AlBr₃ < AlCl₃ < AlI₃

Answer

(d) AlCl₃ < AlF₃ < AlBr₃ < AlI₃

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