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Question

Which of the following molecular species/compound is not hypovalent?


A
CH+3
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B
B2H6
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C
NH+2
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D
AlF3
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Solution

The correct option is D $$AlF_3$$
Those species which have the central atom with less than eight electrons in the outermost shell or valence shell are considered as hypovalent species.


Electronic configuration of :

Al - 2,8,3

We can see in the figure,

In $$AlF_3$$, central element (Al) is in Al(+3) state. So its configuration is

Al(+3) - 2,8

Since there are 8 electrons remaining in the valence shell of the central atom in $$AlF_3$$. So, $$AlF_3$$ is not “Hypervalent”.
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1296074_1124903_ans_767814bd35b7497bac09b979acf9b6ba.PNG

Chemistry

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