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In which of the following pairs of molecules/ ions BF_{3}, NO^{-}_{2} , NH^{-}_{2} and H_{2}O , the central atom is sp^{2}  hybridized?

  • Option 1)

    NH^{-}_{2} and H_{2}O

  • Option 2)

    NO^{-}_{2} and H_{2}O

  • Option 3)

    BF_{3} and NO^{-}_{2} 

  • Option 4)

    NO^{-}_{2} and NH^{-}_{2}

 

Answers (1)

best_answer

As we learnt in 

Dettermination of shape of molecules using VSEPR Theory -

calculate \:X

X=(No.\;of\:valence\:electrons\:of\:central\:atom\:)+(No.\:of\:other\:atom\:)+(Negative\:charge\:on\:the\:molecule)-(Positive\:charge\:on\:the\:molecule)

-

 

 H=\frac{1}{2}\left [ V+M-C+A \right ]\\

V = no. of valence electrons 

M = no. of surrounding monavalent atoms 

C = cationic charge 

A = anionic charge 

\\In\:BF_{3},H=\frac{1}{2}\left [ 3+3-0+0 \right ]=3,sp^{2}\:hybridization \\*\\ In\:NO_{2}^{-},H=\frac{1}{2}\left [ 5+0-0+1 \right ]=3,sp^{2}\: hybridization\\*\\ In\:NH_{2}^{-},H=\frac{1}{2}\left [ 5+2-0+1 \right ]=4,sp^{3}\: hybridization\\*\\ In H_{2}O,H=\frac{1}{2}\left [ 6+2-0+0 \right ]=4,sp^{3}\: hybridization\\


Option 1)

NH^{-}_{2} and H_{2}O

This solution is incorrect 

Option 2)

NO^{-}_{2} and H_{2}O

This solution is incorrect 

Option 3)

BF_{3} and NO^{-}_{2} 

This solution is correct 

Option 4)

NO^{-}_{2} and NH^{-}_{2}

This solution is incorrect 

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