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Question

Which of the following is least stable?

A
BF3
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B
BCl3
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C
BBr3
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D
BH3
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Solution

The correct option is A BH3
As the BH3 is electron deficient molecule it is unstable and forms dimer called diborane(B2H6). even though the remaining BF3,BCl3,BBr3 are also electron deficient but because of the large size of the florine,chlorine and bromine atoms these can not form dimers as borane.
Hence option D is correct.

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