Question

Which of the following resonating structure of 1-Methoxy-1,3-butadiene is least stable ?

• A. – CH = CH – CH = – CH3
• B. CH2= CH – – CH = – CH3
• C. – $\stackrel { \oplus } { \mathrm { C } } \mathrm { H }$ – CH = CH – O – CH3
• D. CH2 = CH – $\stackrel { \oplus } { \mathrm { C } } \mathrm { H }$ – – OCH3

Answer 1

Answer: (D)

CH2 = CH – $\stackrel { \oplus } { \mathrm { C } } \mathrm { H }$ – – OCH3

Answer 2

In (4) negative charge and lone pair on adjacent position.