Which of the following fluoro-compounds is most likely to behave as a Lewis base? [2016]

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Solution

Q.
Which of the following fluoro-compounds is most likely to behave as a Lewis base [2016]

1 ${BF}_{3}$

2 ${PF}_{3}$

3 ${CF}_{4}$

4 ${SiF}_{4}$

Ans.
(2)

${BF}_{3}$ $\to$ Lewis acid (incomplete octet)

${PF}_{3}$ $\to$ Lewis base (presence of lone pair on P atom)

${CF}_{4}$ $\to$ Complete octet

${SiF}_{4}$ $\to$ Lewis acid (empty d-orbital in Si-atom)

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