Which of the following not assumed as trihalide- (1) TlCl3 (2) TlI3 (3) AlCl3 (4) None of these
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answer is none of these.
BF3 does not exist as an ionic trihalide because of the absence of d-orbitals, boron is unable to expand its octet. Therefore, maximum covalence of boron does not exceed 4 and it reacts with Lewis bases such as NH3 to complete its octet.
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