19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which among the following statements are true with respect to electronic displacement in a covalent bond ? (1) Inductive effect operates through pi bond (2) Resonance effect operates through sigma bond (3) Inductive e…
In which of the following molecule the resonance effect is not present? (a) (b) (c) (d)
Mesomeric effect involves delocalisation of
Which of the following is least stable?
The most unlikely representation of resonance structure of p–nitrophenoxide ion is: (a) (b) (c) (d)
GENERAL ORGANIC CHEMISTRY The most stable canonical structure among these is
The stability order of these canonical structures is
Among these compounds, which one has shortest C—Cl bond?
Which of the following statements is true about this molecule ?
Resonance structure of a molecules should have
Electromeric effect is
Polarisation of electrons in acrolein may be written as (a) (b) (c) (d)
III II I CH CH CH C CH Which of these groups has +I effect ?
In the following benzyl/allyl system (R is alkyl group) decreasing order of inductive effect is
Which of the groups has highest + I effect?
Which of the following has minimum-I-effect?
The arrangement of (CH3)3C—, (CH3)2CH—, CH3CH2 — when attached to benzene or unsaturated group in increasing order of inductive effect is GENERAL ORGANIC CHEMISTRY
Which of these groups has –I effect?
Inductive effect of Cl atom operates in (a) CH CH CH Cl (b) CH CH CH CH Cl (c)
F COOCH COCl I II III Which of these groups has –I effect?
Negative inductive effect is shown by
Which among the following free radicals is most stable? (a) (b) (c) (d) GENERAL ORGANIC CHEMISTRY
Arrange the following free radicals in order of decreasing stability. Methyl (I), Vinyl (II), Allyl (III), Benzyl (IV)
Assertion: Tertiary carbocations are generally formed more easily than primary carbocations. Reason: Hyperconjugation as well as inductive effect due to additional alkyl groups stabilize tertiary carbocations.
Assertion: Tropylium cation is more stable than Reason: It is stabilized by both resonance effect and inductive effect.