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Consider the species CH 4 , + 4 NH and – 4 BH . Choose the correct option with respect to these species.

1. They are isoelectronic and only two have tetrahedral structures
2. They are isoelectronic and all have tetrahedral structures.
3. Only two are isoelectronic and all have tetrahedral structures.
4. Only two are isoelectronic and only two have tetrahedral structures.

Correct answer: They are isoelectronic and all have tetrahedral structures.

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