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JEE Main Chemistry question

ChemistryOrganic Chemistry - Some Basic Principles and TechniquesJEE Main

The correct order of decreasing stability of the following resonance structures of acrolein (written as cumulated-charge canonical forms I, II, III, IV, differing in the position of the formal negative/positive charges and the degree of covalent bonding) is

Answer: (B)

Solution

Among resonance structures, the most stable are those with (i) the maximum number of covalent bonds, and (ii) negative charge on the more electronegative atom. Structure (I), with the greatest number of covalent bonds and negative charge on the electronegative nitrogen/oxygen-type centre, is the most

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Question ID VK-155918