Q.

Which of the following statement is correct ?

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a

C-F bond is stronger than Si-F bond because C-F bond length is shorter than that Si-F

b

C-F bond is weaker than Si-F bond because of less difference in electro negativity

c

Si-F bond is stronger than C-F bond because of double bond character due to back bonding from F to Si

d

Si-F bond is stronger than C-F bond due to more different in electronegative

answer is C.

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Detailed Solution

∴In CF4 No formation of back π-bondsIn SiF4, due to the availability of empty d-ortials it involes in back π bonding formation with fluorine lonepair electrons and hence the Si-F bond aquires double bond character.∴Si-F bond is Strong where as in case of CF4 C-F bond, do not aquires double bond character due to lack of empty d-ortials in the valency shell of carbon.therefore C-F bond is always single bond.
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Which of the following statement is correct ?