Ochem - resonance stability

[RCT PC CRN]

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See the attached file.

As per the answer, #2 is more stable then #3

In #2 there is a + charge on electronegative atom O, I thought that is no-no..then how come #2 is more stable then #3?

 

[Bio Dental Mom]

See the attached file.

As per the answer, #2 is more stable then #3

In #2 there is a + charge on electronegative atom O, I thought that is no-no..then how come #2 is more stable then #3?

#2 is more stable than #3 b/c it has resonance (notice double bond)... when it comes to acidity, just know that resonance is king! and that it beats all other choices. I believe that is why...

 

[UCB05]

ii) is more stable than iii) because all atoms have full octets. Between iii) and iv) not only do neither have full octets, in iv) the less electronegative atom (C) has the negative charge and the more electronegative atom (O) has the positive charge.