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4. Which of t...

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4. Which of the two structures (a) and (b) given below is more stabilised by resonance? Explain. a) CH3COOH b) (CH3COO)–

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Q. (a) How carboxylate ion get stabilised by resonance? Explain by the structure.
(b) Carboxylic acids are more acidic than phenols. Explain.

Q. Resonance structures of propenal are given below. Which of these resonating structure is more stable? Give reason for your answer.

C H_{2} = C H - C H = O I ⟷ \oplus C H_{2} - C H = C H - ⊝ O I I

1^{o}

allylic halides are more reactive than

1^{o} R X

S_{N} 1

reaction
Reason: Allylic carbocation intermediate is stabilised by resonance

The structures for compounds (A) and (B) are given.

Also, resonance structures I, II, and III for each compound (A) and (B) are given.

Which structure (I, II, III) is not a resonance form of compound (A)?

Which structure (I, II, III) is not a resonance form of compound (B)?

H_{2} ¨ C - N \equiv N :

H_{2} C = N = ¨ N :

H_{2} C - ¨ N = ¨ N :

Consider structural formulas A,B and C:

(A) Are A,B and C constitutional isomers, or are they resonance forms?
(B) Which structures have a negatively charged carbon?
(C) Which structures have a positively charged carbon?
(D) Which structures have a positively charged nitrogen?
(E) Which structures have a negatively charged nitrogen?
(F) What is the net charge on each structure?
(G) Which is a more stable structure, A or B and why?
(H) Which is a more stable structure, B or C and why?

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