Q.

BF3, PF3, CF4, SiF4, PF5. How many can neither act like a Lewis acid nor like a Lewis base

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a

1

b

2

c

3

d

4

answer is A.

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Detailed Solution

BF3 ….  Lewis acid …… less than octetSiF4  ….  Lewis acid …… can expand octetPF5 ….  Lewis acid …… can expand octetPF3 ….  Lewis base …… contains a lone pair on central atom, can also act as Lewis acid due to availability of vacant d-orbital.CF4 ….. Not a Lewis acid …… cannot expand valency.CF4 ….. Not a Lewis base …… No lone pair on central atom.
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BF3, PF3, CF4, SiF4, PF5. How many can neither act like a Lewis acid nor like a Lewis base