Chemistry Question Bank

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.

Which carbocation is the most stabilized? (a) (b) GENERAL ORGANIC CHEMISTRY (c) (d)