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2.30

Expert-verified
Organic Chemistry
Found in: Page 82

Short Answer

Which species are Lewis bases?

a.

b.

c.

d.

a. Lewis base.

b. Not Lewis base.

c. Lewis base.

d. Lewis base.

See the step by step solution

Step by Step Solution

Lewis bases

The Lewis bases have atleast one lone pair of electrons that can be donated to the other deficient group.

The non-bonding electrons, anions or double and triple bonded element that has two pi electrons.

Stepwise explanation

a.

The nitrogen atom in the given molecule is the fifteenth group element. Therefore, it has 5 valence electrons.

The three electrons of nitrogen are shared with the three hydrogen atoms, and the two remaining electrons are present on the nitrogen atom that are lone pair. Therefore, acts as a Lewis base.

b.

The carbon atom in the given molecule is the fourteenth group element. Therefore, it has 4 valence electrons. All four electrons are shared with hydrogen and carbon. Therefore, no lone pair is present on any carbon. Therefore, does not act as a Lewis base.

c.

The given hydride ion is an ion of the hydrogen atom. The hydrogen atom has 1 valence electron. So, by accepting an electron, the hydrogen atom becomes a hydride ion with a lone pair. Therefore, acts as a Lewis base.

d.

In the given molecule, there is a triple bond. The triple bond is formed by the two pi electrons, which can be transferred due to sidewise overlapping (weak overlapping). Therefore, acts as a Lewis base.

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