1.

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

Answer»

`OVERSET(Theta)CH_2-CH=CH-CH=overset(o+)O-CH_3`
`overset(Theta)CH_2-overset(o+)CH=CH-CH=O-CH_3`
`CH_2=CH_2-overset(Theta)CH-CH=overset(o+)O-CH_3`
`CH_2=CH_2-overset(Theta)CH-overset(o+)CH-O-CH_3`

Solution :In 1-Methyoxy-1,3-butadiene
`(CH_2=CH-CH=CH-underset(ddot)overset(ddot)O-CH_3)` there is conjuction between the lone pair on oxygen and pie bonds. Therefore, OPTIONS (A) and (B) are its correct resonating sturctures with COMPLETE octets of all the atoms. In structure (D) electron definciency of postiviely charged carbon is comprensated by lone pair ELECTRONS on adjucent oxygen atom while such neighbour group sppport is not available in structure that of OPTION (C).


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