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Reaction Mechanism Mcq Neet Chemistry
Quiz 2
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Q.1
+I effect is shown by ....
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a) - NO2
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b) - Cl
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c) - Br
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d) -CH3
Explanation
Answer:(d)
Q.2
Maximum -I effect is exerted by the group
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a) C6H5 -
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b) - OCH3
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c) Cl
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d) NO2
Explanation
Answer:(d)
Q.3
Assertion: CHF3 is more acidic than CHCl3 Reason: Electron releasing group decreases the acidity while electron withdrawing groups increases the acidity
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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:(e)
Q.4
Electromeric effect
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a) comes into play at the emand of attacking reagent
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b) involves displacement of electrons in a sigma bond
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c) comes into play in the molecule when at least one atom has unshared pair of electron
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d) involves the distortion of the electron cloud
Explanation
Answer:(a)
Q.5
The reaction intermediate produce by homolytic cleavage of bond is called ... [ CET J and K 2007]
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a) carbocations
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b) carbanions
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c) free radicals
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d) carbenes
Explanation
Answer:(c)
Q.6
Heterolytic fission of carbon-carbon bond produces
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a) two free radicals
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b) two carbocations
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c) two carbanions
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d) one cation and one anion
Explanation
Answer:(d)
Q.7
The most stable carbocation is ...
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a) methyl carbocation
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b) primary carbocation
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c) secondary carbocation
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d) tertiary carbocation
Explanation
Answer:(d)
Q.8
The most stable carbanion is ..
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a) methyl carbanion
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b) primary carbanion
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c) secondary carbanion
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d) tertiary carbanion
Explanation
Answer:(a)
Q.9
A free radical is ....
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a) shortly lived species
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b) neutral in nature
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c) paramagnetic
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d) all of these
Explanation
Answer:(d)
Q.10
The number of electrons, present in the valence shell of carbon of CH3C+H2 ion bering +ve charge, is
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a) 8
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b) 7
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c) 6
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d) 4
Explanation
Answer:(c)
Q.11
The number of electrons, present in the valence shell of carbon of carbanion bearing -ve charge, is ...
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a) 8
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b) 7
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c) 6
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d) 4
Explanation
Answer:(a)
Q.12
The shape of [CH3]+ is ...
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a) triangular planar
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b) square planar
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c) tetrahedral
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d) none of these
Explanation
Answer:(a)
Q.13
Assertion: The greater the s-character of the hybrid orbitals, the greater is the electronegativity. Reason: The change in hybridization is associated with a change in electronegativity
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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)
Q.14
Which of the following statements is wrong?
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a) A tertiary free radical is more stable than a secondary free radical
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b) A secondary free radical is more stable than a primary free radical
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c) A tertiary carbocation is more stable than a secondary carbocation
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d) A primary carbocation is more stable than a secondary carbocation
Explanation
Answer:(d)
Q.15
Most stable carbocation is ...
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a) CH3 - C+H2
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b) C+H2CHCl2
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c) C+H2CH2Cl
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d) CH3-CH2NO2
Explanation
Answer:(a)
Q.16
The shape of carbanion, [CH3]- is :
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a) linear
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b) pyramidal
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c) planar
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d) tetrahedral
Explanation
Answer:(b)
Q.17
In carbocation, the carbon atom bearing the positive charge is :
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a) sp3 - hybridized
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b) sp-hybridized
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c) dsp2 - hybridized
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d) sp2 - hybridized
Explanation
Answer:(d)
Q.18
Which one of the following characteristics belongs to electrophile?
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a) Electron rich species
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b) Electron deficient species
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c) Anionic in nature
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d) Cationic in nature
Explanation
Answer:(b)
Q.19
A nucleophile must have
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a) a lone pair of electron
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b) an electron deficient centre
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c) a negative charge
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d) a positive charge
Explanation
Answer:(a)
Q.20
The follwoing reaction is : C2H5Br + KOH → C2H5OH + KBr
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a) electrophilic substitution
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b) elimination
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c) nucleophilic substitution
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d) addition
Explanation
Answer:(c)
Q.21
Reasonance is due to
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a) delocalisation of sigma-electrons
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b) delocalisation of pi-electrons
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c) migration of H-atoms
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d) migration of protons
Explanation
Answer:(b)
Q.22
which of the following statements is correct about a carbocation?
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a) It reacts with nuclophile
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b) It can undergo rearrngement
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c) It can element an H+ to form an olefin
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d) All are correct
Explanation
Answer:(d)
Q.23
Hyperconjugation is most useful for stabilizing which of the following carbocations?
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a) neo-Pentyl
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b) tert-Butyl
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c) iso- Propyl
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d) Ethyl
Explanation
Answer:(b)
Q.24
Assertion: Free radicals are short lived and highly reactive Reason: Free radicals are highly unstable
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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)
Q.25
The stability of the following carbocation decreases in the order:
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a) IV > III > II > I
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b) IV > II > III > I
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c) IV > II > I > III
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d) IV > I > II > III
Explanation
Answer:(c)
Q.26
Heterolytic fission of a covalent bond can form
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a) free radical
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b) both carbocation and carbanion
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c) only carbocation
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d) only carbaion
Explanation
Answer:(b)
Q.27
Which behaves both as a nucleophile and electrophile?
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a) CH3NH2
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b) CH3
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c) CH3CN
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d) CH3Cl
Explanation
Answer:(c)
Q.28
Stability order in the following carbocations
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a) I > IV > III > II
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b) I > II > III > IV
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c) III > IV > I > II
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d) III > II > I > IV
Explanation
Answer:(d)
Q.29
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.30
Which of the following contains three pairs of electron?
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a) Cabocation
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b) Carbanion
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c) Free radical
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d) None of these
Explanation
Answer:(a)
0 h : 0 m : 1 s
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