The order of covalent nature for aluminium halides is AlF3 < AlCl3 < AlBr3 < AlI3. The best explanation according to Fajan's rules is:
A. Al3+ is larger in size and hence it has greater polarizing power.
B. The polarizability of halide ions increases with increase in their size and hence the covalent nature also increases.
C. The polarizability of halide ions decreases with increase in their size and hence the covalent nature decreases.
D. The given order of covalent nature is due to greater polarizing power of Al3+ ion.
Answer:B
The order of covalent nature for aluminium halides is AlF3 < AlCl3 < AlBr3 < AlI3. The best explanation according to Fajan's rules is:
A. Al3+ is larger in size and hence it has greater polarizing power. B. The polarizability of halide ions increases with increase in their size and hence the covalent nature also increases. C. The polarizability of halide ions decreases with increase in their size and hence the covalent nature decreases. D. The given order of covalent nature is due to greater polarizing power of Al3+ ion.