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Q.

Which of the following has the lowest melting point?

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a

AlI3

b

AlF3

c

AlBr3

d

AlCl3

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 AlBr3 is a molecular compound with weak intermolecular interactions its melting point is lower

AlI3 and AlBr3 are predominantly covalent compounds. Hence, AlI3  has higher M.P. than AlBr3 (London dispersion forces).

Hence correct option is D

 

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