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Resonance: rules, conditions and drawing resonating structures

27 questions on Resonance: rules, conditions and drawing resonating structures from the General Organic Chemistry I: Electronic Effects chapter: 5 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 groups shows a +M (+R) effect? NEET level
Which of the following is a -M group? NEET level
In benzene, which statement about the carbon-carbon bonds is correct? NEET level
Which of the following species is stabilised by resonance? NEET level
Which of the following carbocations is the most stable? NEET level
Count all the contributing resonance structures of the carbonate ion CO3^2- that obey the standard rules (same sigma framework, octet rule obeyed), counting equ... JEE Main level
In which of the following ions or molecules are all the C-O bonds of equal length? JEE Main level
Which of the following is a resonance contributor of acrolein, CH2=CH-CH=O? JEE Main level
Which of the following is a necessary condition for resonance? JEE Main level
The dipole moment of chlorobenzene (about 1.6 D) is smaller than that of chlorocyclohexane (about 2.2 D). The main electronic reason is that in chlorobenzene JEE Main level
Which of the following is the strongest base in water? JEE Main level
Arrange the carbocations in decreasing order of stability: (P) CH2=CH-CH2^+, (Q) CH3CH2CH2^+, (R) CH2=CH^+. JEE Main level
Arrange in decreasing order of acidity: (P) CH3COOH, (Q) C6H5OH, (R) CH3CH2OH, (S) CH3CH3. JEE Main level
4-Nitrophenol is a stronger acid than 3-nitrophenol because JEE Main level
In which of the following is the lone pair of the nitrogen atom part of the aromatic pi sextet? JEE Main level
Which of the following pairs consists of two resonance contributors of the same species? JEE Main level
Count the distinct resonance structures of the phenoxide ion C6H5O^-, counting each different Kekule arrangement separately: the negative charge on oxygen (with... JEE Advanced level
The pKa of 4-nitrophenol is about 7.2, whereas that of 3,5-dimethyl-4-nitrophenol is about 8.3. The best explanation is that in the dimethyl compound JEE Advanced level
Which compound has the least extent of delocalisation of the nitrogen lone pair into the benzene ring? JEE Advanced level
Which of the following is the most unstable (antiaromatic) species? JEE Advanced level
Which hydrocarbon is the most acidic? JEE Advanced level
Acetamide, CH3CONH2, is protonated on oxygen rather than on nitrogen because JEE Advanced level
In methyl vinyl ether, CH2=CH-OCH3, the terminal CH2 carbon is the most electron-rich carbon because JEE Advanced level
Which of the following carbocations are stabilised by resonance (delocalisation involving a pi bond or lone pair)? JEE Advanced level
In which of the following is the nitrogen lone pair delocalised by resonance? JEE Advanced level
Which statements about resonance are correct? JEE Advanced level
Which statements about the acidity of nitrophenols are correct? JEE Advanced level