JEE Mains Chemistry Past PapershardMCQ SINGLE

The correct stability order of the following resonance structures of CH3 –CH = CH–CHO is CH3–CH–CH=CJEE Mains Chemistry Past Papers Chemistry Question

Question

The correct stability order of the following resonance structures of CH3 –CH = CH–CHO is CH3–CH–CH=C–H CH3–CH–CH=C–H O I O O II III CH3–CH=CH–C–H (A) II > III > I (B) III > II > I (C) I > II > III (D) II > I > III

Answer: B

💡 Solution & Explanation

CH3–CH–CH=CH (II)  O O  CH3–CH=CH–CH (III) Non Polar R.S. More No of covalent bond CH3–CH–CH=CH (I)  O  Having –ve charge on more electronegative atom Having –ve charge on less electronegative atom  Stability order III > II > I

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