How it is aromatic ?

Answer 1

Well, how many #pi-"electrons"# does it have...?

It has got #6#. Are they constrained in a ring? #"Yes..."# Are they delocalized around the ring? #"Yes again..."# the boron atom is coordinatively unsaturated.
And by these criteria the beast is aromatic...in that it fulfils the #"Huckel Criterion"#
For a carbocylic analogue see the tropylium cation, #C_7H_7^+# which is isoelectronic...
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Answer 2

A molecule is considered aromatic if it satisfies the following criteria:

  1. It must be cyclic.
  2. It must be planar.
  3. It must follow Hückel's rule, which states that it must have 4n + 2 π electrons, where n is a non-negative integer.

If a molecule meets all three criteria, it is considered aromatic. This designation is important because aromatic compounds exhibit unique stability and reactivity due to their delocalized π electron system.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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