Which of the following is least likely to behave as Lewis base? 1) OH 2)H2O 3)NH3 4)BF3

Question

Answer

BF3 Since it is an electron deficient species

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BF3

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4(BF3)

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OH

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why??

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As lewis base are those who have lone pair to donate but BF3 does not have any lone pair to donate so it least lewis basic among all which are given

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can I lock ur answer prathmesh

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option 4

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I think 1)OH

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it is BF3 a Lewis acid

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friends u all have choosen all the options but which one is right

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guys plz tell me the right answer and the reason plzzz

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3

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oh,H2O,NH3 are Lewis base

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I am very poor in chemistry fir vi sayad water hoga

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c nh3

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NH3 is strong lewis acid

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BF3 bcoz BF3 is electron poor and has empty orbital so it can accept electron and acts as Lewis acidq

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option d

Answer

Introduction:
In order to determine which of the given compounds is least likely to behave as a Lewis base, we need to understand the concept of Lewis bases and their properties. A Lewis base is a species that donates an electron pair to form a coordinate bond with a Lewis acid. The strength of a Lewis base depends on its ability to donate electron pairs.

Explanation:
Let's analyze each compound and its characteristics to determine which one is least likely to behave as a Lewis base:

1) OH:
- The hydroxyl group (OH) contains an oxygen atom bonded to a hydrogen atom.
- Oxygen is more electronegative than hydrogen, which creates a polar bond.
- Oxygen has two lone pairs of electrons, which can be donated to a Lewis acid.
- The lone pairs of electrons on oxygen make OH a good Lewis base.

2) H2O:
- Water (H2O) consists of two hydrogen atoms bonded to an oxygen atom.
- Oxygen has two lone pairs of electrons, which can act as a Lewis base.
- The lone pairs on oxygen are responsible for the ability of water to form hydrogen bonds.
- Water is a good Lewis base due to the presence of lone pairs on the oxygen atom.

3) NH3:
- Ammonia (NH3) contains three hydrogen atoms bonded to a nitrogen atom.
- Nitrogen has one lone pair of electrons, making it capable of acting as a Lewis base.
- The lone pair on nitrogen allows NH3 to form coordinate bonds with Lewis acids.
- Ammonia is a strong Lewis base due to the presence of a lone pair on nitrogen.

4) BF3:
- Boron trifluoride (BF3) consists of a boron atom bonded to three fluorine atoms.
- Boron does not have any available lone pairs of electrons.
- Without lone pairs, BF3 cannot donate electrons and form coordinate bonds.
- BF3 is least likely to behave as a Lewis base because it lacks a source of electron donation.

Conclusion:
Based on the analysis, the compound least likely to behave as a Lewis base is BF3. Unlike the other compounds (OH, H2O, and NH3), BF3 lacks any available lone pairs of electrons and cannot donate electron pairs to form coordinate bonds. Therefore, BF3 is the least likely to act as a Lewis base among the given compounds.

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