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B — F bond length in BF3 and [BF4]^-are ...

B — F bond length in `BF_3` and `[BF_4]^-`are respectively -

A

154 pm and 133 pm

B

138 pm and 98 pm

C

130 pm and 143 pm

D

133 pm and 113 pm

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(a) Explain why BF_(3) exists whereas BH_(3) does not. (b) Compare the B-F bond length in BF_(3) and BF_(4)^(-)

Suggest reasons why the B–F bond lengths in BF_(3) (130 pm) and BF_(4 )^(– ) (143 pm) differ.

B- bond length in \(BF_{3}\) is "130" pm and in \(BF_{4}^{-}\) is "143" due to (A) less electronegativity of fluorine in \(BF_{4}^{-}\) (B) back bonding in \(BF_{3}\) (C) more electronegativity of boron in \(BF_{3}\) (D) tetrahedral shape of \(BF_{4}^{-}\)

Statement-1 : The B-F bond length in BF_(3) is not identical with that in BF_(4)^(-) because Statement-2 : Back bonding is involved in BF_(4)^(-) but not in BF_(3)

Knowledge Check

  • Statement-1 : The B-F bond length in BF_(3) is not identical with that in BF_(4)^(-) because Statement-2 : Back bonding is involved in BF_(4)^(-) but not in BF_(3)

    A
    Statement -1 is true, Statement-2 is true and statement-2 is correct explanation for statement -1.
    B
    Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1
    C
    Statement-1 is true, statement-2 is false
    D
    Statement-1 is false, statement-2 is true.

  • Back bonding in BF_(3) does not afect

    A
    planarity, lewis acidic strength and bond angle
    B
    bond length, hybridisation and bond strength
    C
    bond angle, planarity, geometry
    D
    Lewis acidity, bond length, bond order (B-F)

  • In BF_3 , the B-F bond length is 1.30 Å, when BF_3 is allowed to be treated with Me_3N , it forms an adduct, Me_3N rarr BF_3 , the bond length of B-F in the adduct is

    A
    greater than 1.30 Å
    B
    smaller than 1.30 Å
    C
    equal to 1.30 Å
    D
    none of these.