Arrange the following in decreasing order of stability. ( a ) C ⊝ H 2 - 1 NO 2 , C ⊝ H 2 - 2 CHO CH ≡ 3 C ⊝ ( b ) CH 3 - CH 2 - 1 CH 2 - C ⊝ H 2 CH 3 - C ⊝ H 2 - CH 2 CH 3 CH 3 2 C ⊝ H 3 - CH 2 CH 3

Part - a 1 . The stability of carbanion directly proportional to number of electron withdrawing species (electrophile) or their electron withdrawing capacity. 2 . Stability of carbanion directly proportional to - I effect. 3 . The order of electron withdrawing capacity ( - I effect) of various functional groups. So correct order of stability of carbanion in the given question- 1 > 2 > 3 (least stable) Part - b:- According to question, 1 is 1 0 Alkyl carbanion, 2 is 2 0 Alkyl carbanion, & 3 is 3 0 Alkyl carbanion The stability order of various Alkyl carbanion is - 1 0 > 2 0 > 3 0 . It is due to that R -group show + I Effect & stability of carbanion is indirectly proportional to + I Effect (number of nucleophile of electron donor species or their electron donor capacity).

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 208

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The weakest $+ M$ group of the given species is:

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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 210

In hyperconjugation there is overlap between:

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 211

Which of the following cannot exhibit hyperconjugation?

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 212

Which of the following alkenes will show maximum number of hyperconjugation forms?

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 215

The decreasing order of electron density on the ring is

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 216

The stability order of alkene in following compounds is

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 217

Select the correct statement about this compound

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 218

Arrạnge the stability of following

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Alpha Question Bank for Engineering: Chemistry>Chapter 23 - Organic Chemistry- Some Basic Principles and Techniques>Exercise-1>Q 220

Arrange the following in decreasing order of stability.

$(a)$	$\overset{⊝}{C} H_{2} \underset{1}{-} {NO}_{2},$	$\overset{⊝}{C} H_{2} \underset{2}{-} CHO$	$CH \underset{3}{\equiv} \overset{⊝}{C}$
$(b)$	${CH}_{3} - {CH}_{2} \underset{1}{-} {CH}_{2} - \overset{⊝}{C} H_{2}$	${CH}_{3} - \overset{⊝}{C} \underset{2}{H} - {CH}_{2} {CH}_{3}$	${({CH}_{3})}_{2} \overset{⊝}{C} \underset{3}{H} - {CH}_{2} {CH}_{3}$