Which of following molecule can show Lewis acidity.(I) CO2(II) Br2(III) SnCl2(IV) HF (V) NMe3

Lewis acid is that acid that can accept lone pairs of electrons. Molecules that are electron-deficient or have vacant orbitals, act as Lewis acids. In carbon dioxide, C is bonded with two oxygen atoms. Due to the electronegative character of O, carbon has a partial positive character and can attract a lone pair of electrons, Therefore, CO2 acts as a Lewis acid.In Br2, one Br has a partial positive charge and one Br has a partial negative charge. This positive charge can accept a lone pair of electrons. Therefore, Br2 acts as a Lewis acid.In SnCl2, Sn is bonded with two Cl atoms. Due to the electronegative character of Cl, Sn has a partial positive character and can attract a lone pair of electrons, Therefore, SnCl2 acts as a Lewis acid.

Which of following molecule can show Lewis acidity.(I) CO2(II) Br2(III) SnCl2(IV) HF (V) NMe3

Lewis acid is that acid that can accept lone pairs of electrons. Molecules that are electron-deficient or have vacant orbitals, act as Lewis acids. In carbon dioxide, C is bonded with two oxygen atoms. Due to the electronegative character of O, carbon has a partial positive character and can attract a lone pair of electrons, Therefore, CO2 acts as a Lewis acid.In Br2, one Br has a partial positive charge and one Br has a partial negative charge. This positive charge can accept a lone pair of electrons. Therefore, Br2 acts as a Lewis acid.In SnCl2, Sn is bonded with two Cl atoms. Due to the electronegative character of Cl, Sn has a partial positive character and can attract a lone pair of electrons, Therefore, SnCl2 acts as a Lewis acid.

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Which of following molecule can show Lewis acidity.
(I) CO₂
(II) Br₂
(III) SnCl₂
(IV) HF
(V) NMe₃

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III, IV

I, II, III

I, III, IV

II, III, V

answer is B.

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Detailed Solution

Lewis acid is that acid that can accept lone pairs of electrons. Molecules that are electron-deficient or have vacant orbitals, act as Lewis acids.

In carbon dioxide, C is bonded with two oxygen atoms. Due to the electronegative character of O, carbon has a partial positive character and can attract a lone pair of electrons, Therefore, CO₂ acts as a Lewis acid.
In Br₂, one Br has a partial positive charge and one Br has a partial negative charge. This positive charge can accept a lone pair of electrons. Therefore, Br₂ acts as a Lewis acid.
In SnCl₂, Sn is bonded with two Cl atoms. Due to the electronegative character of Cl, Sn has a partial positive character and can attract a lone pair of electrons, Therefore, SnCl₂ acts as a Lewis acid.

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