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Which of the following compounds is an example of *incomplete* octet of the central atom?
ASF₆
BBF₃
CNH₃
DPCl₅
Answer & Solution
Correct answer: B. BF₃
**BF₃** — boron has only 6 electrons around it (3 B–F bonds), an incomplete octet. PCl₅ and SF₆ show *expanded* octets; NH₃ obeys the octet.
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