Ans E. should be most stable as all the atoms has their octate complete and ther

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E. should be most stable as all the atoms has their octate complete and there is nothing to disturb its stability

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A. It cannot be most stable as the positive charge is on highly electronegative oxygen atom,also negative charge on carbon makes it quite unstable as carbon is not very electronegative to hold extra negative charge

B. extreme left carbon does not have its octate complete and also there are 3 bonds formed with oxygen , 1 double bond and one single bond with -CH3 ,which makes it very unstable due to its unwanted structure and should have residual positive charge on oxygen , making is quite unstable

C.total no. of electrons on oxygen becomes 10 , which is not possible and is highly unstable as oxygen cannot expand its octate and it can go maximum 2s22p6 that is maximum of 8 electrons but here we have 2 lone pair electrons , 3 bond pair electrons = 10 electrons

D. positive charge on sp2 carbon makes is unstable,there is no other electron donating group to stablize positive charge , anyways it would still be unstable than the original neutral molecule

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