Q.1
Which of the following has the highest nucleophilicity?
  • a) F-
  • b) OH-
  • c) CH3-
  • d) NH2-
Q.2
Consider the following carbocations:
ch-25_que_no-74_img_no1.png
  • a) II < I < III < IV
  • b) II < III < I < IV
  • c) III < I < II < IV
  • d) IV < III < I < II
Q.3
Which one of the following carbocations is most stable?
  • a)
    ch-25_qn-75choice_img_no1.png
  • b)
    ch-25_qn-75choice_img_no2.png
  • c)
    ch-25_qn-75choice_img_no3.png
  • d)
    ch-25_qn-75choice_img_no4.png
Q.4
Which of the following contains three pairs of electron?
  • a) Carbocation
  • b) Carbanion
  • c) Free radical
  • d) None of these
Q.5
The kind of delocalization involving sigma bond orbitals is called
  • a) hybridization
  • b) conjugatioon
  • c) hyperconjugation
  • d) conformation
Q.6
Hyperconjugation phenomenon is possible in
  • a) H2C = CH2
  • b) CH3CH2 - CH = CH2
  • c) C6H5CH = CH2
  • d) (CH3)3C - CH = CH2
Q.7
Which of the following has the highest nucleophilicity?
  • a) F-
  • b) OH-
  • c) CH3-
  • d) NH2-
Q.8
Consider the following carbocations The correct sequqence of the stability of these is
ch-25_que_no-80_img_no1.png
  • a) II < I < III < IV
  • b) II < III < I < IV
  • c) III < I < II < IV
  • d) IV < III < I < II
Q.9
The arrangeent of (CH3)3 C -, (CH3)2CH - , CH3CH2 - when attached a benzene or an unsaturated group in increasing order of inductive effect is
  • a) (CH3)3 C - < (CH3)2CH - < CH3CH2 -
  • b) CH3CH2 - < (CH3)2CH - < (CH3)3 C -
  • c) (CH3)2CH- < (CH3)3 C - < CH3CH2 -
  • d) (CH3)3 C - < CH3CH2 - < (CH3)2CH-
Q.10
Which of the following statements regarding the resonance energy of benzene is correct?
  • a) The energy required to break the C - H bond in bezene
    ch-25_qn-82choice_img_no4.png
  • b) The energy required to break the C - C bond in benzene
  • c) The energy is a measure of stability of benzene
  • d) The energy required to convert
Q.11
Which of the following is the correct order of stability of free radicals? [ PMT (Delhi) 2002]
  • a) benzyl > allyl > 3° > 2°
  • b) allyl > benzyl > 3° > 2°
  • c) allyl > 3° > 2° benzyl
  • d) benzyl > 3° > 2° allyl
Q.12
Arrange the following nucleophiles in the order of their nucleophilic strength ... [ MGIMS (Wardha) 2003]
  • a) OH- > CH3COO- > CH3O- > C6H5O-
  • b) CH3COO- < C6H5O- < CH3O- < OH-
  • c) C6H5O- < CH3COO- < CH3O- < OH-
  • d) CH3COO- < C6H5O- < OH- < CH3O-
Q.13
The stability of Me2C = CH2 is more than that of MeCH2CH = CH2 due to
  • a) inductive effect of the Me group
  • b) resonance effect of the Me group
  • c) hyperconjugative effect of the Me group
  • d) resonance as well as inductive effect of the Me group
Q.14
Among the following carbocations: the order of stability is
ch-25_que_no-86_img_no1.png
  • a) IV > II > I > III
  • b) I > II > III > IV
  • c) II > I > IV > III
  • d) I > IV > III > II
Q.15
Due to the presence of an unpired electron, free radicals are ... [ JCECE 2008]
  • a) chemically reactive
  • b) chemically inactive
  • c) anions
  • d) cations
Q.16
The increasing order of stability of the following free radicals is
  • a)
    ch-25_qn-88choice_img_no1.png
  • b)
    ch-25_qn-88choice_img_no2.png
  • c)
    ch-25_qn-88choice_img_no3.png
  • d)
    ch-25_qn-88choice_img_no4.png
Q.17
Hyperconjugation involves overlap of the following orbitals
  • a) σ - σ
  • b) σ - p
  • c) p - p
  • d) π - π
Q.18
Which among the following statement are true with respect to electronic displacement in a covalent bond? [ PMT 2008] (1) Inductive effect operates through a π-bond (2) Resonance effect operates through a σ- bond (3) Inductive effect operates through a σ-bond (4) Resonance effect operates through a π-bond. (5) Resonance and inductive effects operates through σ-bond
  • a) 1 and 2
  • b) 2 and 3
  • c) 2 and 3
  • d) 3 and 4
Q.19
CH3CH2Cl undergoes homolysis fission produces
  • a)
    ch-25_qn-91choice_img_no1.png
  • b)
    ch-25_qn-91choice_img_no2.png
  • c)
    ch-25_qn-91choice_img_no3.png
  • d)
    ch-25_qn-91choice_img_no4.png
Q.20
The temporary effect in which there is a complete transfer of a shared pair of pi-electrons to one of the atoms joined by a multiple bond on the demand of an arttacking reagent is called
  • a) inductive effect
  • b) electromeric effect
  • c) hyperconjugation
  • d) positive resonance effect
Q.21
The stablest free radical among the following is
  • a)
    ch-25_qn-93choice_img_no1.png
  • b)
    ch-25_qn-93choice_img_no2.png
  • c)
    ch-25_qn-93choice_img_no3.png
  • d)
    ch-25_qn-93choice_img_no4.png
Q.22
Which of the following is not true regarding electromeric effect? [ CET (karnataka) 2021]
  • a) It requires an attacking reagent
  • b) It is a temperary effect
  • c) It operates on multiple bonds
  • d) It results in the apperance of partial charges on the carbon atoms
Q.23
Free radicals can undergo
  • a) disproportionation to two species
  • b) rearrangement to a more stable free radical
  • c) decomposition to give another free radical
  • d) all of the above are correct
Q.24
The most stable carbocation is :
  • a)
    ch-25_qn-96choice_img_no1.png
  • b)
    ch-25_qn-96choice_img_no2.png
  • c)
    ch-25_qn-96choice_img_no3.png
  • d)
    ch-25_qn-96choice_img_no4.png
Q.25
Assertion: Methl cyanide is a nucleophile as well as an electrophile Reason: Electrophiles are electron loving and nucleophiles are nucleus loving species.
  • a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
  • b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c) Assertion is true, but Reason is false
  • d) Assertion and Reason are false
Q.26
Removal of hydride ion from a methane molecule will give a
  • a) methyl radical
  • b) carbocation
  • c) carbanion
  • d) methyl group
Q.27
The electromeric effect in organic compounds is a
  • a) temporary effect
  • b) permanent effect
  • c) temporary - permanent effect
  • d) none of the above
Q.28
Heterolysis of carbon-chlorine bond productes
  • a) two free radicals
  • b) two carbocation
  • c) two carbanions
  • d) one cation and one anion
Q.29
The arrangement of decreasing order of stability of
  • a)
    ch-25_qn-101choice_img_no1.png
  • b)
    ch-25_qn-101choice_img_no2.png
  • c)
    ch-25_qn-101choice_img_no3.png
  • d)
    ch-25_qn-101choice_img_no4.png
Q.30
Assertion : Allyl and benzyl carbonium ions are stable than propyl carbonium ions Reason: Electron releasing group stabilized carbonium ion
  • a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
  • b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c) Assertion is true, but Reason is false
  • d) Assertion and Reason are false
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