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Quiz 3
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Q.1
Which of the following has the highest nucleophilicity?
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a) F-
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b) OH-
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c) CH3-
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d) NH2-
Explanation
Answer:(c)
Q.2
Consider the following carbocations:
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a) II < I < III < IV
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b) II < III < I < IV
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c) III < I < II < IV
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d) IV < III < I < II
Explanation
Answer:(a)
Q.3
Which one of the following carbocations is most stable?
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a)
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b)
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c)
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d)
Explanation
Answer:(a)
Q.4
Which of the following contains three pairs of electron?
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a) Carbocation
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b) Carbanion
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c) Free radical
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d) None of these
Explanation
Answer:(a)
Q.5
The kind of delocalization involving sigma bond orbitals is called
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a) hybridization
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b) conjugatioon
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c) hyperconjugation
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d) conformation
Explanation
Answer:(c)
Q.6
Hyperconjugation phenomenon is possible in
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a) H2C = CH2
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b) CH3CH2 - CH = CH2
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c) C6H5CH = CH2
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d) (CH3)3C - CH = CH2
Explanation
Answer:(b)
Q.7
Which of the following has the highest nucleophilicity?
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a) F-
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b) OH-
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c) CH3-
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d) NH2-
Explanation
Answer:(c)
Q.8
Consider the following carbocations The correct sequqence of the stability of these is
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a) II < I < III < IV
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b) II < III < I < IV
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c) III < I < II < IV
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d) IV < III < I < II
Explanation
Answer:(a)
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
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a) (CH3)3 C - < (CH3)2CH - < CH3CH2 -
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b) CH3CH2 - < (CH3)2CH - < (CH3)3 C -
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c) (CH3)2CH- < (CH3)3 C - < CH3CH2 -
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d) (CH3)3 C - < CH3CH2 - < (CH3)2CH-
Explanation
Answer:(a)
Q.10
Which of the following statements regarding the resonance energy of benzene is correct?
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a) The energy required to break the C - H bond in bezene
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b) The energy required to break the C - C bond in benzene
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c) The energy is a measure of stability of benzene
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d) The energy required to convert
Explanation
Answer:(c)
Q.11
Which of the following is the correct order of stability of free radicals? [ PMT (Delhi) 2002]
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a) benzyl > allyl > 3° > 2°
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b) allyl > benzyl > 3° > 2°
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c) allyl > 3° > 2° benzyl
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d) benzyl > 3° > 2° allyl
Explanation
Answer:(a)
Q.12
Arrange the following nucleophiles in the order of their nucleophilic strength ... [ MGIMS (Wardha) 2003]
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a) OH- > CH3COO- > CH3O- > C6H5O-
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b) CH3COO- < C6H5O- < CH3O- < OH-
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c) C6H5O- < CH3COO- < CH3O- < OH-
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d) CH3COO- < C6H5O- < OH- < CH3O-
Explanation
Answer:(c)
Q.13
The stability of Me2C = CH2 is more than that of MeCH2CH = CH2 due to
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a) inductive effect of the Me group
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b) resonance effect of the Me group
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c) hyperconjugative effect of the Me group
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d) resonance as well as inductive effect of the Me group
Explanation
Answer:(c)
Q.14
Among the following carbocations: the order of stability is
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a) IV > II > I > III
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b) I > II > III > IV
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c) II > I > IV > III
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d) I > IV > III > II
Explanation
Answer:(b)
Q.15
Due to the presence of an unpired electron, free radicals are ... [ JCECE 2008]
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a) chemically reactive
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b) chemically inactive
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c) anions
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d) cations
Explanation
Answer:(a)
Q.16
The increasing order of stability of the following free radicals is
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a)
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b)
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c)
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d)
Explanation
Answer:(a)
Q.17
Hyperconjugation involves overlap of the following orbitals
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a) σ - σ
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b) σ - p
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c) p - p
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d) π - π
Explanation
Answer:(aWhich among the following statements are true withrespect to electronic displacement in a covalent bond)
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
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a) 1 and 2
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b) 2 and 3
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c) 2 and 3
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d) 3 and 4
Explanation
Answer:(c)
Q.19
CH3CH2Cl undergoes homolysis fission produces
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a)
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b)
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c)
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d)
Explanation
Answer:(a)
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
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a) inductive effect
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b) electromeric effect
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c) hyperconjugation
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d) positive resonance effect
Explanation
Answer:(b)
Q.21
The stablest free radical among the following is
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a)
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b)
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c)
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d)
Explanation
Answer:(d)
Q.22
Which of the following is not true regarding electromeric effect? [ CET (karnataka) 2021]
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a) It requires an attacking reagent
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b) It is a temperary effect
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c) It operates on multiple bonds
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d) It results in the apperance of partial charges on the carbon atoms
Explanation
Answer:(d)
Q.23
Free radicals can undergo
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a) disproportionation to two species
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b) rearrangement to a more stable free radical
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c) decomposition to give another free radical
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d) all of the above are correct
Explanation
Answer:(d)
Q.24
The most stable carbocation is :
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a)
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b)
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c)
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d)
Explanation
Answer:(a)
Q.25
Assertion: Methl cyanide is a nucleophile as well as an electrophile Reason: Electrophiles are electron loving and nucleophiles are nucleus loving species.
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a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
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b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
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c) Assertion is true, but Reason is false
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d) Assertion and Reason are false
Explanation
Answer:(c)
Q.26
Removal of hydride ion from a methane molecule will give a
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a) methyl radical
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b) carbocation
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c) carbanion
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d) methyl group
Explanation
Answer:(b)
Q.27
The electromeric effect in organic compounds is a
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a) temporary effect
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b) permanent effect
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c) temporary - permanent effect
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d) none of the above
Explanation
Answer:(a)
Q.28
Heterolysis of carbon-chlorine bond productes
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a) two free radicals
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b) two carbocation
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c) two carbanions
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d) one cation and one anion
Explanation
Answer:(d)
Q.29
The arrangement of decreasing order of stability of
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a)
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b)
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c)
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d)
Explanation
Answer:(b)
Q.30
Assertion : Allyl and benzyl carbonium ions are stable than propyl carbonium ions Reason: Electron releasing group stabilized carbonium ion
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a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
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b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
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c) Assertion is true, but Reason is false
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d) Assertion and Reason are false
Explanation
Answer:(b)
0 h : 0 m : 1 s
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