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$$I.\ \overset{\ominus}CH_2-\overset{\oplus}CH-CH=CH-O-CH_3$$
$$II.\ \overset{\ominus}CH_2-CH=CH-\overset{\oplus}CH-O-CH_3$$
$$III.\ CH_2=CH-\overset{\ominus}CH-\overset{\oplus}CH-O-CH_3$$
$$IV.\ CH_2=CH-\overset{\ominus}CH-CH=\overset{\oplus}O-CH_3$$

$$CH_{2}=CH-CH=CH-O-CH_{3}$$ has the following above resonating structures. 

The correct order of stability of these resonating structures is:


A
IV>III>II>I
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B
III>IV>II>I
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C
III>II>I>IV
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D
IV>I>III>II
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Solution

The correct option is C $$IV > I > III > II$$
$$IV > I > III > II$$
$$CH_2=CH-\overset{\ominus}{C}H-CH=\overset{\oplus }{O}-CH_3 > \overset{\ominus}CH_2-\overset{\oplus }CH-CH=CH-O-CH_3$$
                         $$IV$$                                                                       $$I$$
$$> CH_2=CH-\overset{\ominus}{C}H-\overset{\oplus}{C}H-O-CH_3 > \overset{\ominus}{C}H_2-CH = CH - \overset{\oplus}{C}H - O - CH_3$$
                            $$III$$                                                                  $$II$$
The structure is unstable when opposite charges are present on adjacent atoms.
Structure having maximum number of covalent bonds is most stable. - $$OCH_3$$ exerts a $$- I$$ and $$+M$$ effect.
Also in structure IV, octet of all atoms are complete but in others octet of one carbon is incomplete. 

Chemistry

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