Acylium cation has two resonating sturctures (I) and (II),
`R-underset(I)overset(o+)C=overset(* *)O:harrR-underset(II)C-=overset(o+)O:`
Which statement is correct of (I) and (II)?

Which of the following resonating structures is not correct for CO_2 ? overset(-):overset(..)underset(..)O-underset(I)C-=overset(+)O:harr:overset(+)underset(..)O-underset(II)C-=underset(..)Ooverset(-):harr overset(..)underset(..)O=underset(III)C=overset(..)underset(..)Oharr:overset(+)O-=underset(IV)C-underset(..)overset(..)Ooverset(-):harr

Compare the stabilities of the following pairs of resonance contributing structures (a) R-underset((I))overset(o+)(C)= ddotO: harrR-C=overset(o+)ddotO:underset((II))(("acylium ion")) (b) underset((III))(Me-overset(o+)underset( underset(..)( :O)^(ddotTheta))underset(|) ddot(S)-Me)harrunderset((IV))(Me-underset(underset(..)( :O))underset(||)(ddotS)-Me) (c) underset((V))(Me_(2)C=underset(Me)underset(|)(C)-overset(o+)ddotO:harr)underset((VI))(Me_(2)overset(o+)(C)-underset(Me)underset(|)(C)=overset(o+)ddot(O: ) (d) underset((VII))(H_(2)C=ddotO:harr)underset((VII))(H_(2)overset(o+)C)-ddotO:^(Theta)

Consider the following compounds O_(2)N-CH_(2)-underset((I))overset(O)overset(||)C-OH" "F-CH_(2)-underset((II))overset(O)overset(||)C-OH" "Ph-CH_(2)-underset((III))overset(O)overset(||)C-OH" "CH_(3)-underset((IV))(CH_(2))-overset(O)overset(||)C-OH Which statement is/are correct :

Consider the following compounds O_(2)N-CH_(2)-underset((I))overset(O)overset(||)C-OH" "F-CH_(2)-underset((II))overset(O)overset(||)C-OH" "Ph-CH_(2)-underset((III))overset(O)overset(||)C-OH" "CH_(3)-underset((IV))(CH_(2))-overset(O)overset(||)C-OH Which statement is/are correct :

The correct stability order of the following resonance structures is : x H_(2)C=overset(o+)underset((I))N=overset(Ɵ)N H_(2)overset(o+)Cunderset((II))-N=overset(Ɵ)N H_(2)overset(Ɵ)C-underset((III))overset(o+)N-=N H_(2)overset(Ɵ)C-underset((IV))N=overset(o+)N