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Chapter 20: Q56E (page 1145)

Write the two resonance structures for the pyridinium ion, \({C_5}{H_5}N{H^ + }. \)

Short Answer

Expert verified

The given ion is pyridinium ion.

Pyridine is derivative of benzene which contains one nitrogen atom in the ring instead of one carbon atom.

This structure is also aromatic like benzene since a lone pair of nitrogen isn't included in the\(\pi \)conjugated system inside the ring.

The resonance forms of pyridinium ion:

Resonance forms of the pyridinium ion

Step by step solution

01

To find the pyridine or pyridinium ion:

The given ion is pyridinium ion.

Pyridine is derivative of benzene which contains one nitrogen atom in the ring instead of one carbon atom.

This structure is also aromatic like benzene since a lone pair of nitrogen isn't included in the\(\pi \)conjugated system inside the ring.

The resonance forms of pyridinium ion:

Resonance forms of the pyridinium ion

02

The resonance structures of pyridinium ion

All \(\pi \)bonds inside the ring move to the adjacent single C-C bond, which becomes a double bond.

On the other hand, double bonds become single as \(\pi \)electrons move.

Resonance forms of pyridinium ion

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