7
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Basic Principles of Organic Chemistry
Resonance structure of molecule does not have
[IIT JEE 1984]
(a) Identical arrangement of atoms
(b) Nearly the same energy content
(c) The same number of paired electrons (d) Identical bonding
All bonds in benzene are equal due to [Roorkee 1990; KCET 1998]
(a) Tautomerism
(b) Inductive effect
(c) Resonance
(d) Isomerism
Benzene is unreactive because
(a) It has double bonds
(b) It has carbon-carbon single bond
2
(c) Carbon are sp hybridised
(d) π electrons are delocalised
‘C – C’ bond length in benzene lies between single and double bond. The reason is
[RPET 1999]
(a) Resonance
(b) Isomerism
(c) Metamerism
(d) Inductive effect
Which of the following is observed in ethylene molecule
[MH CET 2002]
(a) Electromeric effect
(b) Inductive effect
(c) Homolytic fission
(d) None of these
Orbital interaction between the sigma bonds of a substituent group and a
neighbouring π orbital is known as…
[Kerala PMT 2004]
(a) Hyperconjugation
(b) Inductive effect
(c) Steric effect
(d) Dipole-dipole interactions
The order of decreasing stability of the carbanions …
[KCET 1996]
−
(1) (CH ) C −
(2) (CH ) CH
3 3
8.
9.
10.
1
3 2
−
− is
(3) CH 3CH
(4) CH
2
3
(a) 1 > 2 > 3 > 4
(b) 4 > 3 > 2 > 1
(c) 4 > 1 > 2 > 3
(d) 1 > 2 > 4 > 3
Which of the following species is paramagnetic in nature
(a) Free radical
(b) Carbonium ions
(c) Carbanion
(d) All the above
In which of the following species the centre C-atom is negatively charged
(a) Carbanion
(b) Carbonium ion
(c) Carbocation
(d) Free radical
The order of increasing stability of the carbonium ions …
(1) (CH 3 )3 C ⊕ −
(2) (CH 3 )2 CH ⊕ −
(3) CH 3CH 2⊕ −
(a) 1 < 2 < 3 < 4
(c) 1 < 4 < 2 < 3
(4) CH 3⊕ − is
(b) 4 < 3 < 2 < 1
(d) 3 < 4 < 1 < 2
Basic Principles of Organic Chemistry / 7_4_A
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2
Which of the following free radicals is most stable…?
(a) Primary
(b) Methyl
(c) Secondary
(d) Tertiary
Which of the following contains three pairs of electrons…?
[BHU 1985]
(a) Carbocation
(b) Carbanion
(c) Free radical
(d) None of these
Which of the following carbanion is most stable
(a) Methyl
(b) Primary
(c) Secondary
(d) Tertiary
Among the given cations, the most stable carbonium ion is… [IIT 1981; AIIMS 1985,
2001, MNR 1988; CBSE PMT 1988, 2005]
(a) sec-butyl
(b) tert-butyl
(c) n-butyl
(d) None of these
Heterolytic fission of carbon-chlorine bond produces…
[MNR 1986; MP PET/PMT 1998]
(a) Two free radicals
(b) Two carbonium ions
(c) two carbanions
(d) One cation and one anion
Which of the following intermediate have the complete octet around the carbon atom
[Orissa JEE 2003]
(a) Carbonium ion
(b) Carbanion ion
(c) Free radical
(d) All have same electron
Which of the following is an electrophile…?
[J & K 2005]
(a) H2O
(b) SO3
(c) NH3
(d) ROR
Which of the following is nucleophile…?
(a) R2NH
(b) SO3
+
(c) NO2
(d) BF3
Which kind of fission is favoured by sunlight
[CPMT 2004; RPMT 2006]
(a) Heterolytic fission
(b) Homolytic fission
(c) Both (a) and (b)
(d) None of these
Which is a nucleophile…?
[AMU 2006]
(a) Carbonium ion
(b) Carbanion
(c) Both (a) and (b)
(d) None of these
Hyperconjugation involves overlap of the following orbitals…
[IIT JEE 2008]
(a) σ – σ
(b) σ – p
(c) p – p
(d) π – π
Mesomeric effect involves delocalization of …
[KECT 2008]
(a) Protons
(b) Sigma electrons
(c) Pi electrons
(d) None of these
Basic Principles of Organic Chemistry / 7_4_A
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3
Hyperconjugation effect is also known as …
[AMU PMT 2009]
(a) Mesomeric effect
(b) No bond resonance
(c) Both (a) and (b)
(d) None of these
An alkyl halide may be converted into an alcohol by
[Pb. PMT 2000]
(a) Elimination
(b) Addition
(c) Substitution
(d) Dehydro halogenation
Conversion of CH4 to CH3Cl is an example of which of the following reaction…
[Pb. CET 2001]
(a) Substitution
(b) Addition
(c) Elemination
(d) Rearrangement
Which is an electrophile…?
[DCE 2002]
(a) BCl3
(b) CH3OH
(c) NH3
(d) AlCl4−
Which is an electrophile…?
[DCE 2000]
(a) AlCl3
(b) CN–
(c) NH3
(d) CH3OH
Bromination of alkanes involves which type of reaction…
(a) Substitution
(b) Addition
(c) Elemination
(d) Rearrangement
Which of the following alkyl groups has the maximum +I effect…
[KCET 2002; AMU PMT 2009]
(a) CH3 –
(b) (CH3)2 CH –
(c) (CH3)3 C –
(d) CH3 CH2 –
Ammonia molecule is
(a) A nucleophile
(b) An electrophile
(c) A homolytic
(d) An acid
Electrophiles are…
(a) Electron loving species
(b) Electron hating species
(c) Nucleus loving regents
(d) Nucleus hating reagents
Nucleophiles are
(a) Electron loving species
(b) Electron hating species
(c) Nucleus loving regents
(d) Nucleus hating reagents
Due to its sextet (having six electrons), the carbonium ions are
(a) Unstable
(b) Very stable
(c) Negatively charged
(d) None of these
The +I – effect (inductive effect) is shown by
(a) – CH3
(b) – OH
(c) – F
(d) – C6H5
The – I effect is shown by
(a) – COOH
(b) – CH3
(c) – CH2CH3
(d) – CHR2
Basic Principles of Organic Chemistry / 7_4_A
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4
Which of the following is an Electrophilic reagent?
(a) H2O
(b) OH(c) NO2+
(d) None of these
Shifting of electrons of a multiple bond under the influence of a reagent is
called
(a) I - effect
(b) E-effect
(c) M-effect
(d) All above
In carbonium ion the carbon bearing the positive charge is
(a) sp-Hybridized
(b) sp2-Hyrbdised
(d) None of these
(c) sp3-Hyrbdised
Which group has the maximum Inductive effect?
(a) – NO2
(b) – CN
(c) – COOH
(d) – F
Zero inductive effect is shown by
(a) C6H5
(b) H
(d) Cl
(c) CH3
Basic Principles of Organic Chemistry / 7_4_A
7
Basic Principles of Organic Chemistry
Paper Code : 7_4_A
Chapter
:7
Std
: 11th Sem-I
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School
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Basic Principles of Organic Chemistry / 7_4_A