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Which of the following has the lowest melting point?

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${AlI}_{3}$

${AlF}_{3}$

${AlBr}_{3}$

${AlCl}_{3}$

answer is D.

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Detailed Solution

aluminum bromide has the lowest melting point

Aluminium bromide has a melting point of 97.5 °C when it is anhydrous and 93 °C when it is hexahydrate. Aluminium bromide has a 252 °C hexahydrate boiling point and a 255 °C anhydrous boiling point.

Because aluminium [tri]bromide ${AlBr}_{3}$ is a molecular compound with weak intermolecular interactions its melting point is lower

${AlI}_{3}$ and ${AlBr}_{3}$ are predominantly covalent compounds. Hence, ${AlI}_{3}$ has higher M.P. than ${AlBr}_{3}$ (London dispersion forces).

Hence correct option is D

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