Exceptions of octet rule are:
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AlCl3, CCl4, SF6, PCl5
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BCl3, NF3, SF6, PCl3
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BeCl2, BCl3, SF4, NH3
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BeCl2, BF3, SF6, PCl5
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NF3, BF3, SF4, PCl3
D
Correct answer
Explanation
BeCl2 : 4 electron in valence shell of Be ( incomplete octet)
BF3 : 6 electrons is valence shell of B (incomplete octet)
SF6 : 12 electrons in valence shell of S (expanded octet).
PCl5 : 10 electrons in valence shell of P (expanded octet).
All are exceptions of octet rule.