Q.1
Which of the follwoing contains only three pairs of electrons?
  • a) Carbocation
  • b) Carbanion
  • c) Free radical
  • d) None of these
Q.2
Electrophiles are
  • a) electron loving species
  • b) electrom hating species
  • c) nucleus loving reagents
  • d) nucleus hating reagent
Q.3
Nucleophiles are
  • a) electron loving
  • b) electron hating
  • c) nucleus loving
  • d) nucleus hating
Q.4
Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)
  • a) – NH2 > – OR > – F
  • b) – NR2 < – OR < – F
  • c) – NH2 < – OR < – F
  • d) – NR2 > – OR > – F
Q.5
The correct statement regarding electrophile is ... [ NEET 2017]
  • a) Electrophile is negatively charge species and can form a bnd by accepting a pair oof electrons from a nucleophile
  • b) Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
  • c) Electrophile are generally neutral species and can form a bond by accepting a pair of electrons from a uncleophile
  • d) Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile
Q.6
The pair of electron in the given carbanion CH3C ≡C-, is present in which orbitals? [ NEET 2016, Pahe I]
  • a) sp3
  • b) sp2
  • c) sp
  • d) 2p
Q.7
Consider the following compounds Hyperconjugation occurs in
ch-25_que_no-7_img_no1.png
  • a) I only
  • b) II only
  • c) III only
  • d) I anad III
Q.8
Which of the following is the most correct electron displacement for a nucleophilic reaction to take place? [ AIPMT 2015]
  • a)
    ch-25_qn-8choice_img_no1.png
  • b)
    ch-25_qn-8choice_img_no2.png
  • c)
    ch-25_qn-8choice_img_no3.png
  • d)
    ch-25_qn-8choice_img_no4.png
Q.9
Which one is most reactive towards nucleophilic addition reaction? [ AIPMT 2014]
  • a)
    ch-25_qn-9choice_img_no1.png
  • b)
    ch-25_qn-9choice_img_no2.png
  • c)
    ch-25_qn-9choice_img_no3.png
  • d)
    ch-25_qn-9choice_img_no4.png
Q.10
Which one of the following is most reactive towards electrophilic reagent? [ AIPMT 2011]
  • a)
    ch-25_qn-10choice_img_no1.png
  • b)
    ch-25_qn-10choice_img_no2.png
  • c)
    ch-25_qn-10choice_img_no3.png
  • d)
    ch-25_qn-10choice_img_no4.png
Q.11
The stability of carbanions in the following is in the order of ... [ AIPMT 2008]
ch-25_que_no-11_img_no1.png
  • a) (i) > (ii) > (iii) > (iv)
  • b) (iii) > (iii) > (iiv) > (i)
  • c) (iv) > (ii) > (iii) > (i)
  • d) (i) > (ii) > (iii)
Q.12
Base strength of is in the order of ... .. [ AIPMT 2008]
ch-25_que_no-12_img_no1.png
  • a) (ii) > (i) > (iii)
  • b) (iii) > (ii) > (i)
  • c) (i) > (iii) > (ii)
  • d) (i) > (ii) > (iii)
Q.13
Which one of the following is most reactive towards electrophilic attack? [ AIPMT 2008]
  • a)
    ch-25_qn-13choice_img_no1.png
  • b)
    ch-25_qn-13choice_img_no2.png
  • c)
    ch-25_qn-13choice_img_no3.png
  • d)
    ch-25_qn-13choice_img_no4.png
Q.14
Which of the following is least reactive in a nucleophilic substitution reaction? [ AIPMT 2004]
  • a) (CH3)3C - Cl
  • b) CH2 = CHCl
  • c) CH3CH2Cl
  • d) CH2 = CHCH2Cl
Q.15
In HS-, I-, RNH2, NH2 order of proton accepting tendency will be ...[ AIPMT 2001]
  • a) I- > NH3 > RNH2 > HS-
  • b) NH3 > RNH3 HS- > I-
  • c) RNH2 > NH3 > HS- > I -
  • d) HS> > RNH2 > NH3 > I-
Q.16
Among the following compounds the decreasing order of reactivity towards electrophilic substitution is ... ..[ AIMPT 200]
ch-25_que_no-17_img_no1.png
ch-25_que_no-17_img_no2.png
ch-25_que_no-17_img_no3.png
ch-25_que_no-17_img_no4.png
  • a) II > I > III > IV
  • b) III > I > II > IV
  • c) IV > I > II > III
  • d) I > II > III > IV
Q.17
Correct the increasing order of acidity is as ..[ AIPMT 1994]
  • a) H2O, C2H2, H2CO3, phenol
  • b) C2H2, H2O, H2CO3, phenol
  • c) Phenol, C2H2, H2CO3, H2O
  • d) C2H2, H2O, Phenol and H2CO3
Q.18
1° carbocation is more stable than 2° carbocation Reason: Stability ofcarbocation is due to hypercongugation effect.
  • 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.19
Which of the following folecules is least resonance stabilised? [ IIT 2017 main]
  • a)
    ch-25_qn-20choice_img_no1.png
  • b)
    ch-25_qn-20choice_img_no2.png
  • c)
    ch-25_qn-20choice_img_no3.png
  • d)
    ch-25_qn-20choice_img_no4.png
Q.20
The order of stability of the following carbocations [ IIT mains 2013]
ch-25_que_no-21_img_no1.png
  • a) III > II > I
  • b) II > III > I
  • c) I > II > III
  • d) III > I > II
Q.21
The correct stability order of the following resonance structure is ... [ IIT 2009]
ch-25_que_no-22_img_no1.png
  • a) (I) > (II) > (IV) > (III)
  • b) (I) > (III) > (II) > (IV)
  • c) (II) > (I) > (III) > (IV)
  • d) (III) > (I) > (IV) > (II)
Q.22
Hyperconjugation involves overlap of the following orbitals [ IIT 2008]
  • a) σ - σ
  • b) σ - p
  • c) p - p
  • d) π - π
Q.23
ssertion: Tertiary carbonium ions are generally formed more easily than primary carbonium ions. Reason: Hyperconjugative as well as inductive effect due to additional alkyl group stabilize tertiary carbonium ions
  • 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.24
The correct stability order for the following species is ... [ IIT 2008]
ch-25_que_no-26_img_no1.png
  • a) (II) > (IV) > (I) > (III)
  • b) (I) > (II) > (III) > (IV)
  • c) (II) > (I) > (IV) > (III)
  • d) (I) > (III) > (II) > (IV)
Q.25
Assertion: Polarisation of one σ-bond caused by the polarization of adjacent σ-bond is referred to as the inductive effect. Reason: The substituents can be classified as electron withdrawing or electron donating groups relative to hydrogen.
  • 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
For 1-methoxy-1, 3-butadiene, which of the following resonating structure is least stable? ... [ IIT 2005]
  • a)
    ch-25_qn-29choice_img_no1.png
  • b)
    ch-25_qn-29choice_img_no2.png
  • c)
    ch-25_qn-29choice_img_no3.png
  • d)
    ch-25_qn-29choice_img_no4.png
Q.27
Arrange in order of increasing acidic strength ... ...[ IIT 2004]
ch-25_que_no-30_img_no1.png
  • a) X > Z > Y
  • b) Z < x > Y
  • c) X > Y > Z
  • d) Z > X > Y
Q.28
Among the following, the molecule with the highest dipole moment is ... .. [ IIT 2003]
  • a) CH3Cl
  • b) CH2Cl2
  • c) CHCl3
  • d) CCl4
Q.29
Polarisation of electons in acrolein may be written as [ IIT 1988]
  • a)
    ch-25_qn-34choice_img_no1.png
  • b)
    ch-25_qn-34choice_img_no2.png
  • c)
    ch-25_qn-34choice_img_no3.png
  • d)
    ch-25_qn-34choice_img_no4.png
Q.30
Inductive effect refers to ....
  • a) electron displacement along a carbon chain
  • b) complete transfer of one of the shared pair of electrons to one of the atoms joined by a double bond
  • c) complete transfer of electrons hitherto unshared
  • d) none of the above
0 h : 0 m : 1 s