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Which of the following groups (attached with a benzene ring) show +M effect?

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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-1>Q 173
Compare the SIR effect between orthochloro benzoic acid, orthobromobenzoic acid and orthoiodo benzoic acid.
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 174
Define hyperconjugation by taking an example of propene.
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 178
Why cyclooctatetraene is nonplanar?
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 182
Which of the following alkyl group has the maximum +I effect?
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 184
Which of the following is the strongest -I group:
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 192
The compound which is not resonance stabilised
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 194
Which of the following pair is not pair of resonating structures?
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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 198
Which of the following is the least stable resonating structure ?