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Which of the following is incorrect for the stability of structures.

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Important Questions on Organic Chemistry- Some Basic Principles and Techniques

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-2>Q 44
The least contributing resonating structure of nitroethene is
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-2>Q 45
Which of the following statement is correct?
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-2>Q 46

The decreasing order of bond length of C=C bond in the following compounds is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-2>Q 47

Which of the following is correct about the following compound

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-2>Q 48

The correct order of +M effect of 'N' containing functional group on the benzene ring, amongst the given compounds is

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-2>Q 49
In which case the σ -bond pair and π -bond pair of electrons. both are attracted in the same direction, (towards the same atom)
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-2>Q 50

The correct stability order of given resonating structures is:​​​​​

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-2>Q 51

The longest C-N bond length in the given compound is:

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