Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.
(a) \(C_6H_5OH \)
(b) \(C_6H_5NO_2\)
(c) \( CH_3CH=CHCHO\)
(d) \(C_6H_5–CHO \)
(e) \(C_6H_5–C+H_2\)
(f) \(CH_3CH=CH C+H_2\)
(a) \(C_6H_5OH \)
(b) \(C_6H_5NO_2\)
(c) \( CH_3CH=CHCHO\)
(d) \(C_6H_5–CHO \)
(e) \(C_6H_5–C+H_2\)
(f) \(CH_3CH=CH C+H_2\)
Solution and Explanation
(a) The structure of C6H5OH is:
The resonating structures of phenol are represented as:
(b) The structure of C6H5NO2 is:
The resonating structures of nitrobenzene are represented as:
(c) CH3CH = CH - CHO
The resonating structures of the given compound are represented as:
(d) The structure of C6H5CHO is:
The resonating structures of benzaldehyde are represented as:
(e) C6H5-C+H2
The resonating structures of the given compound are:
(f) CH3CH = CHC+H2
The resonating structures of the given compound are:
Top Questions on Structural Representations Of Organic Compounds
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Questions Asked in CBSE Class XI exam
Answer the following :
(a) The casing of a rocket in flight burns up due to friction. At whose expense is the heat energy required for burning obtained? The rocket or the atmosphere?
(b) Comets move around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet’s velocity in general. Yet the work done by the gravitational force over every complete orbit of the comet is zero. Why ?
(c) An artificial satellite orbiting the earth in very thin atmosphere loses its energy gradually due to dissipation against atmospheric resistance, however small. Why then does its speed increase progressively as it comes closer and closer to the earth ?
(d) In Fig. 5.13(i) the man walks 2 m carrying a mass of 15 kg on his hands. In Fig. 5.13(ii), he walks the same distance pulling the rope behind him. The rope goes over a pulley, and a mass of 15 kg hangs at its other end. In which case is the work done greater ?
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(b) Ag+ (aq) and Cu(s)
(c) Fe3+ (aq) and Cu(s)
(d) Ag(s) and Fe3+(aq)
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Concepts Used:
Organic Chemistry – Some Basic Principles and Techniques - Reaction Mechanism
SN1 Reaction Mechanism:
SN1 reaction mechanism takes place by following three steps –
- Formation of carbocation
- Attack of nucleophile
- Deprotonation
SN2 Reaction Mechanism:
The SN2 reaction mechanism involves the nucleophilic substitution reaction of the leaving group (which generally consists of halide groups or other electron-withdrawing groups) with a nucleophile in a given organic compound.
Electrophilic Aromatic Substitution Reaction Mechanism:
The mechanism of an electrophilic aromatic substitution reaction contains three main components which are:
- A new sigma bond from C=C is formed during the reaction in the arene nucleophile.
- Due to the breaking of the C-H sigma bond, a proton is removed.
- The C=C bond is reformed and it restores the aromaticity of the compound.
Electrophilic Substitution Reaction Mechanism:
The electrophilic substitution reaction mechanism is composed of three steps, which will be discussed more below.
- Electrophile Generation
- Carbocation Formation
- Proton Removal