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why SF4 is el...

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why SF4 is electron deficient species ,it should have ten electrons ? why it acts as lewis acids

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Q. Consider the following statements regarding halides of

S

S F_{4}

S C l_{4}

act as Lewis acid only.
(ii)

S F_{4}

S C l_{4}

act as Lewis base only.
(iii)

S F_{4}

S C l_{4}

act both as Lewis acid and Lewis base.

The correct option is:

Q. Assertion: S reacts with

S O_{3}^{2 -}

S_{2} O_{3}^{2 -}

Reason: S is electron deficient and acts an acid and

S O_{3}^{2 -}

is a base in terms of Lewis acid theory.

Read the above assertion and reason and choose the correct option regarding it.

Q. Orthoboric acid acts as Lewis acid. Why ? Draw the structure of Orthoboric acid .

S F_{4}

can act as Lewis acid.
Reason :The compound which contains vacant d-orbitals can act as Lewis acid.

S F_{4}

can act as Lewis acid in the presence of strong Lewis base and as Lewis base in the presence strong Lewis acid.

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