Problem: Which of these compounds or ions is an exception to the octet rule rule: borohydride (BH4–), borazine (B3N3H6, which is analogous to benzene with alternating B and N in the ring), or boron trichloride?

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Which of these compounds or ions is an exception to the octet rule rule: borohydride (BH4–), borazine (B3N3H6, which is analogous to benzene with alternating B and N in the ring), or boron trichloride?

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