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Q.

B - F bond length in BF₃ is (X) pm and in ${BF}_{4}^{-}$ is (Y) pm. values of (X) and (Y) are respectively

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a

X = 143;Y = 130

b

X= 130;Y = 143

c

X = 130; Y = 130 pm

d

X = 143; Y = 143

answer is C.

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Detailed Solution

In BF₃ back bonding is present and in ${BF}_{4}^{-}$ octet is completed and sp³hybridized.

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B - F bond length in BF3 is (X) pm and in BF4- is (Y) pm. values of (X) and (Y) are respectively