Which of the following resonating structures of 1-methoxy- 1, 3-butadiene is least stable?
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a
CH⊖2−CH=CH−CH−O⊕−CH3
b
CH2=CH2−C⊖H−CH−O⊕−CH3
c
CH⊖2−C⊕H−CH=CH−O−CH3
d
CH2=CH−CH⊖ −CH⊕ −O−CH3
answer is C.
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Detailed Solution
The octet of all atoms are complete in structures (1) and (2). In structure (4) electron deficiency of positively charged carbon is duly compensated by lone pair electrons of adjacent oxygen atom, while such neighbor group support is not available in structure (3).