1. PF₃ 2. CF₄ 3. SiF₄ 4. BF₃

Answer: 1. PF₃ Key idea: a Lewis base needs a lone pair to donate. PF₃ : P has a lone pair, so it can act as a donor. CF₄ : no lone pair and no empty orbital on C. SiF₄ : Lewis acid (empty d-orbitals). BF₃ : Lewis acid (incomplete octet).

Topic: General trends, Group 15 and 16· p-Block Elements

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

1. \(PF_3\)

2. \(CF_4\)

3. \(SiF_4\)

4. \(BF_3\)

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 2 Practice test neet Save WhatsApp Report

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Answer: 1. \(PF_3\)

Key idea: a Lewis base needs a lone pair to donate.

\(PF_3\): P has a lone pair, so it can act as a donor.
\(CF_4\): no lone pair and no empty orbital on C.
\(SiF_4\): Lewis acid (empty d-orbitals).
\(BF_3\): Lewis acid (incomplete octet).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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

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