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The least and most stable resonating structures respectively are:

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Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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Alpha Question Bank for Medical: Chemistry>Chapter 21 - Organic Chemistry- Some Basic Principles and Techniques>Exercise 1>Q 204
Which will be the least stable resonating structure:
 
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Alpha Question Bank for Medical: Chemistry>Chapter 21 - Organic Chemistry- Some Basic Principles and Techniques>Exercise 1>Q 205

HNCO (isocyanic acid) has following resonating structures:

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The order of stability is:

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Alpha Question Bank for Medical: Chemistry>Chapter 21 - Organic Chemistry- Some Basic Principles and Techniques>Exercise 1>Q 206

HNCO (isocyanic acid) has the following resonating structures:

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The order of stability is:

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Alpha Question Bank for Medical: Chemistry>Chapter 21 - Organic Chemistry- Some Basic Principles and Techniques>Exercise 1>Q 207

Which of the following resonating structure will contribute minimum to resonance hybrid?

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Alpha Question Bank for Medical: Chemistry>Chapter 21 - Organic Chemistry- Some Basic Principles and Techniques>Exercise 1>Q 208

In each of the following pairs which ion is more stable:

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Alpha Question Bank for Medical: Chemistry>Chapter 21 - Organic Chemistry- Some Basic Principles and Techniques>Exercise 1>Q 209
The mesomeric effect involves the delocalisation of:
 
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Alpha Question Bank for Medical: Chemistry>Chapter 21 - Organic Chemistry- Some Basic Principles and Techniques>Exercise 1>Q 210
Which of the following groups show -m effect?:
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Alpha Question Bank for Medical: Chemistry>Chapter 21 - Organic Chemistry- Some Basic Principles and Techniques>Exercise 1>Q 212
Which of the following group show +m and - I effect ?