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Question

Select the correct statement(s) regarding BF2NH2 molecule :

A
FBF bond angle < 1200
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B
HNH bond angle > 1090 28
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C
HNH bond angle < 1090 28
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D
FBF bond angle > 1200
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Solution

The correct options are
A FBF bond angle < 1200
B HNH bond angle > 1090 28
According to Bent's rule there is more p-character in B-F bond than in B-N bond; hence FBF is less than 1200
As size of NH2 group is larger than F-atom hence repulsion between NH2 group and F-atoms is higher than between two F-atoms. As lone pair of N-atom in NH2 group participate in back bonding hence H-N-H is greater than 109028', as hybridization of N is changing from spa towards close to sp2
1761788_1818885_ans_6502b3ae0bec4f4cb5fb91e379373b88.PNG

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