Q.1
Why is light necessary to bring in chlorination reactions of alkane?
  • a) The dissociation of Cl2 gives free radical
    ch-25_qn-138choice_img_no1.png
  • b) The Cl2 molecues absorbs light to show homolytic bond fission
    ch-25_qn-138choice_img_no3.png
  • c) The formation of free radical propogate the chain reaction
  • d) All of the above
Q.2
Who pointed out the concept of hyperconjugation?
  • a) Nathan and Baker
  • b) Mullikan
  • c) Kekule
  • d) Kolbe
Q.3
Which of the following is free radical?
  • a) Cl-
    ch-25_qn-140choice_img_no4.png
  • b) Cl+
  • c) NO2
  • d)
Q.4
The stability order for carbocations given below is :
ch-25_que_no-141_img_no1.png
  • a) I < II < III
  • b) III < II < I
  • c) III < I < II
  • d) II < I < III
Q.5
The reaction, is called
ch-25_que_no-142_img_no1.png
  • a) elimination reaction
  • b) substitution reaction
  • c) rearrangement reaction
  • d) none of the above
Q.6
Which of the follwoing cannot show electromeric effect?
  • a) Alkenes
  • b) ketones
  • c) aldehydes
  • d) Ethers
Q.7
A secondary (2°) carbon atom is one that is joined to
  • a) 1-alkyl group
  • b) 2-alkyl groups
  • c) 3-alkyl group
  • d) none of these
Q.8
Which of the following is singlet carbene?
  • a) (CH3)3C+
    ch-25_qn-145choice_img_no3.png
  • b) CH2 = CH - C+H2
    ch-25_qn-145choice_img_no4.png
  • c)
  • d)
Q.9
The resonating structures
  • a) differ only in the arrangement of electrons
  • b) differ in number of paired and unpaired electrons
  • c) differ largely in their energy contents
  • d) do not lie in the same plane
Q.10
Which of the following does not show resonance
  • a) Carbon dioxide
  • b) Benzene
  • c) Nitromethane
  • d) Propane
Q.11
The increasing order of +ve I-effect shown by H, CH3, C2H5 and C3H7 is
  • a) H < CH3 < C2H5 < C3H7
  • b) H > CH3 < C2H5 > C3H7
  • c) H < C2H5 < CH3 < C3H7
  • d) none of the above
Q.12
Which of the following can act as an nucleophile?
  • a) BF3
  • b) FeCl3
  • c) ZnCl2
  • d) C2H5MgBr
Q.13
Which one of the following is miost reactive towards electrophilic attack?
  • a)
    ch-25_qn-150choice_img_no1.png
  • b)
    ch-25_qn-150choice_img_no2.png
  • c)
    ch-25_qn-150choice_img_no3.png
  • d)
    ch-25_qn-150choice_img_no4.png
Q.14
The stability of carbanion in the following
ch-25_que_no-151_img_no1.png
  • a) (2) > (3) > (4) > 91)
  • b) (4) > (2) > (3) > (1)
  • c) (1) > (3) > (2) > (4)
  • d) (1) > (2) > (3) > (4)
0 h : 0 m : 1 s