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Reaction Mechanism Mcq Neet Chemistry
Quiz 5
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Q.1
Why is light necessary to bring in chlorination reactions of alkane?
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a) The dissociation of Cl2 gives free radical
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b) The Cl2 molecues absorbs light to show homolytic bond fission
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c) The formation of free radical propogate the chain reaction
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d) All of the above
Explanation
Answer:(d)
Q.2
Who pointed out the concept of hyperconjugation?
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a) Nathan and Baker
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b) Mullikan
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c) Kekule
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d) Kolbe
Explanation
Answer:(a)
Q.3
Which of the following is free radical?
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a) Cl-
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b) Cl+
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c) NO2
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d)
Explanation
Answer:(d)
Q.4
The stability order for carbocations given below is :
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a) I < II < III
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b) III < II < I
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c) III < I < II
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d) II < I < III
Explanation
Answer:(a)
Q.5
The reaction, is called
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a) elimination reaction
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b) substitution reaction
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c) rearrangement reaction
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d) none of the above
Explanation
Answer:(c)
Q.6
Which of the follwoing cannot show electromeric effect?
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a) Alkenes
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b) ketones
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c) aldehydes
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d) Ethers
Explanation
Answer:(d)
Q.7
A secondary (2°) carbon atom is one that is joined to
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a) 1-alkyl group
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b) 2-alkyl groups
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c) 3-alkyl group
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d) none of these
Explanation
Answer:(b)
Q.8
Which of the following is singlet carbene?
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a) (CH3)3C+
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b) CH2 = CH - C+H2
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c)
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d)
Explanation
Answer:(d)
Q.9
The resonating structures
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a) differ only in the arrangement of electrons
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b) differ in number of paired and unpaired electrons
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c) differ largely in their energy contents
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d) do not lie in the same plane
Explanation
Answer:(a)
Q.10
Which of the following does not show resonance
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a) Carbon dioxide
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b) Benzene
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c) Nitromethane
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d) Propane
Explanation
Answer:(d)
Q.11
The increasing order of +ve I-effect shown by H, CH3, C2H5 and C3H7 is
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a) H < CH3 < C2H5 < C3H7
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b) H > CH3 < C2H5 > C3H7
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c) H < C2H5 < CH3 < C3H7
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d) none of the above
Explanation
Answer:(a)
Q.12
Which of the following can act as an nucleophile?
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a) BF3
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b) FeCl3
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c) ZnCl2
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d) C2H5MgBr
Explanation
Answer:(d)
Q.13
Which one of the following is miost reactive towards electrophilic attack?
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a)
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b)
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c)
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d)
Explanation
Answer:(b)
Q.14
The stability of carbanion in the following
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a) (2) > (3) > (4) > 91)
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b) (4) > (2) > (3) > (1)
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c) (1) > (3) > (2) > (4)
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d) (1) > (2) > (3) > (4)
Explanation
Answer:(d)
0 h : 0 m : 1 s
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