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201.

Describe the main characteristic features of resonance.

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202.

Write resonance structures of CH₃COO^– and show the movement of electrons by curved arrows.

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203.

Write resonance structure of C₆H₅NH₂ and show the movement of electrons by curved arrows.

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The following pairs of structures do not constitute resonance structure: (a), (b) and (d).

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205. Draw the resonance structures for the following compounds. Show the electron shift using curved arrow notation:

straight C subscript 6 straight H subscript 5 OH space left parenthesis Phenol right parenthesis

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206. Draw the resonance structures for the following compounds. Show the electron shift using curved arrow notation:

straight C subscript 6 straight H subscript 5 NO subscript 2 thin space left parenthesis Nitrobenzene right parenthesis

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207. Draw the resonance structures for the following compounds. Show the electron shift using curved arrow notation:
CH₃CH = CHCHO

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208. Draw the resonance structures for the following compounds. Show the electron shift using curved arrow notation:

straight C subscript 6 straight H subscript 5 minus CHO

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209. Draw the resonance structures for the following compounds. Show the electron shift using curved arrow notation:

straight C subscript 6 straight H subscript 5 space minus space straight C with plus on top straight H subscript 2

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210. Draw the resonance structures for the following compounds. Show the electron shift using curved arrow notation:

CH subscript 3 CH space equals space CH straight C with plus on top straight H subscript 2

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