Which of the following is a correct resonance structure for compound A?
A) I
B) II
C) III
D) IV
E) none of these

Question

Which of the following is a correct resonance structure for compound A?  
A) I 
B) II 
C) III 
D) IV 
E) none of these

Quizplus · Accepted Answer

The correct way to draw the resonance structure of compound A is to use curved arrows to show how electrons are moving. The double bond in the molecule can move to different locations to form different resonance structures. By evaluating the charges and the stability of each structure, we can determine the most reasonable resonance structure.

In structure IV, we move the double bond from the left-most carbon to the adjacent carbon, generating a positive charge at the left-most carbon and a negative charge at the adjacent carbon. This is the most stable structure as it has no charges on adjacent carbons and exhibits resonance. The other structures have charges on adjacent carbons and are therefore less favorable. Therefore, the correct answer is D.

Which of the Following Is a Correct Resonance Structure for Compound