MolSynapse / Question bank / General Organic Chemistry I: Electronic Effects / Stability of resonating structures and conjugated species

Stability of resonating structures and conjugated species

28 questions on Stability of resonating structures and conjugated species from the General Organic Chemistry I: Electronic Effects chapter: 6 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

Practice this topic All General Organic Chemistry I: Electronic Effects topics

Which of the following carbocations is the most stable? NEET level
Which of the following anions is NOT stabilised by resonance? NEET level
The energy of a resonance hybrid, compared with the energy of its most stable contributing structure, is NEET level
Which of the following carbanions is the most stable? NEET level
Which of the following free radicals is the most stable? NEET level
Which of the following is an aromatic species? NEET level
Arrange the following carbocations in decreasing order of stability: (I) C6H5-CH2+, (II) (CH3)2CH+, (III) CH3-CH2+, (IV) CH3+. JEE Main level
Which of the following cations is the most stable? JEE Main level
Which of the following is a valid resonance contributor of methyl vinyl ether, CH2=CH-O-CH3? JEE Main level
Arrange in decreasing order of acidity: (I) ethanoic acid, (II) phenol, (III) cyclohexanol. JEE Main level
Arrange in decreasing order of basicity in water: (I) cyclohexanamine, (II) aniline, (III) N-phenylethanamide (acetanilide). JEE Main level
Which of the following allylic cations is the most stable? JEE Main level
Which of the following hydrocarbons is the most acidic? JEE Main level
Assertion (A): Cyclopenta-1,3-diene is much more acidic than propene. Reason (R): The conjugate base of cyclopenta-1,3-diene is an aromatic anion with 6 pi elec... JEE Main level
Which of the following species are aromatic? JEE Main level
In which of the following species is the charge delocalised by resonance? JEE Main level
Consider the heptatrienyl cation, CH2=CH-CH=CH-CH=CH-CH2+ (seven carbons in an open chain). Counting every resonance structure in which the positive charge sits... JEE Main level
Consider the cation C6H5-CH=CH-CH2+ (a phenyl group attached to an allyl cation). Count each resonance structure in which the positive charge sits on a differen... JEE Advanced level
Arrange the following cations in decreasing order of stability: (I) 4-methoxybenzyl cation, (II) benzyl cation, (III) 4-nitrobenzyl cation. JEE Advanced level
The following are contributors to the resonance hybrid of propenal: (I) CH2=CH-CH=O, (II) ^+CH2-CH=CH-O^-, (III) ^-CH2-CH=CH-O^+ (carbon anion, oxygen cation, w... JEE Advanced level
Arrange the following in decreasing order of stability: (I) tropylium cation, (II) benzyl cation, (III) (CH3)2CH+, (IV) CH3-CH2+. JEE Advanced level
Arrange in decreasing order of basicity: (I) piperidine, (II) pyridine, (III) pyrrole. JEE Advanced level
Arrange the following radicals in decreasing order of stability: (I) (C6H5)3C., (II) (C6H5)2CH., (III) C6H5-CH2., (IV) CH3.. JEE Advanced level
In the guanidinium cation, C(NH2)3+, the positive charge is delocalised over the three nitrogen atoms by resonance. Assuming that the three equivalent contribut... JEE Advanced level
Which of the following planar cyclic ions is the least stable? JEE Advanced level
Which of the following are aromatic? JEE Advanced level
Which of the following species are antiaromatic? JEE Advanced level
Which of the following carbocations are stabilised by resonance? JEE Advanced level