Q.1
In which of the following species the central carbon atom is negativley charged?
  • a) Free radical
  • b) Carbanion
  • c) Carocation
  • d) None of these
Q.2
In the following carbocations, the stability order is
ch-25_que_no-107_img_no1.png
  • a) III > II > IV > I
  • b) IV > I > II > III
  • c) IV > III > II > I
  • d) III > IV > II > I
Q.3
Which of the follwoing is strongest nucleophile?
  • a) Br-
  • b) :OH-
  • c) :CN-
  • d) C2H5:-
Q.4
reaction involving heterolytic fission are sid to produce via
  • a) ionic mechanism
  • b) polar mechanism
  • c) both 9a) and (b)
  • d) none of these
Q.5
Methylene has sextet of electrons around carbon but bears no formal charge Reason: Methylene behaves as a nucleophile
  • 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.6
For all practical purposes, influence of inductive effect is neglected after:
  • a) 1st carbon atom
  • b) 2nd carbon atom
  • c) 3nd carbon atom
  • d) none of the these
Q.7
Which of the following species is not electrophilic in nature
  • a) Cl+
  • b) BH3
  • c) H3O+
  • d) N+O2
Q.8
The stabilization due to resonance is maximum iin:
  • a) cyclohexane
  • b) cyclohexene
  • c) 1, 3 -cyclohexadiene
  • d) 1, 3, 5 -cyclohexatriene
Q.9
A free radical is
  • a) non existing
  • b) short lived
  • c) diamagnetic
  • d) fairly stable
Q.10
The order of stability of carbanions is
  • a) CH3- > 1° > 2° > 3°
  • b) 3° > 2° > 1° > CH3-
  • c) 3° > 1° > 2° > CH3-
  • d) 2° > 3° > 1° > CH3-
Q.11
The +I.E. (inductive effect) is shown by
  • a) CH3
  • b) -OH
  • c) F
  • d) - C6H5
Q.12
Hyperconjugation is
  • a) σ - π conjugation
  • b) noticed due to delocalisation of σ- and π-bonds
  • c) no bound resonance
  • d) all of the above
Q.13
Species containing carbon with three bonds and an electron are called
  • a) carbanions
  • b) free radicals
  • c) carbenes
  • d) carbocations
Q.14
Which of the follwoing is an electrophilic reagent?
  • a) BF3
    ch-25_qn-120choice_img_no3.png
  • b) RO-
  • c)
  • d) NH3
Q.15
Carbanion can undergo
  • a) rearrangement
  • b) addition to a carbonyl group
  • c) combination with cation
  • d) substitution reaction at a saturated carbon atom
Q.16
The shape of
ch-25_que_no-122_img_no1.png
  • a) linear
  • b) planar
  • c) pyramidal
  • d) none of these
Q.17
A neutral divalent carbon intermediate produced by the removal of two attached atoms is called
  • a) carbene
  • b) carbocation ion
  • c) carbanion
  • d) free radical
Q.18
Which of the following statements is not correct
  • a) primary carbocations are more stable than secondary ones
  • b) Secondary free radicals are more stable than primary free radicals
  • c) Tertiary free radicals are more stable than secondary ones
  • d) Tertiary carbocations are more stable than primary ones
Q.19
Which of the following cannot show electromeric effect?
  • a) Alkenes
  • b) Ketones
  • c) Aldehydes
  • d) Ethers
Q.20
The stability of 2, 3-dimethyl but-2-ene iis more than 2-butene. this can be explained in terms of
  • a) resonance
  • b) hyperconjugation
  • c) electromeric effect
  • d) inductive effect
Q.21
Assertion : HC ≡C- is more stable than H2C = C- Reason: HC ≡ C- has more s-character than H2C = C-
  • 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.22
Zero inductive effect is shown by
  • a) C6H5 -
  • b) -H
  • c) CH3 -
  • d) Cl -
Q.23
In hyperconjugation, the atom involved is
  • a) β- H atom
  • b) α- H atom
  • c) γ-H atom
  • d) all of above
Q.24
Carbanions initiate
  • a) addition reaction
  • b) substitution reactions
  • c) both (a) and (b)
  • d) none of these
Q.25
What information is provided by reaction mechanism?
  • a) The bonds broken and formed
  • b) The reaction intermediates
  • c) The relative rates of discrete steps, especially the slowest one
  • d) all of the above
Q.26
Shifting of electrons of a multiple bond under the influence of a reagent is called
  • a) I-effect
  • b) M-effect
  • c) M-effect
  • d) T-effect
Q.27
Which group has the maximum -Inductive effect?
  • a) -NO2
  • b) -CN
  • c) -COOH
  • d) -F
Q.28
Which group hsa the highest +Inductive effect?
  • a) CH3-
  • b) (CH3)3C -
  • c) CH3CH2 -
  • d) (CH3)3CH -
Q.29
(CH3)4N+ is neither an electrophile , nor a nucleophile because it
  • a) neither has electron pair available for donation nor can accommodate electron since all shells of N are fully occupied
  • b) can act as lweis acid
  • c) does not have electron pair for donation as well as cannot attract electron pair
  • d) none of the above
Q.30
The -I effect is shown by
  • a) -COOH
  • b) -CH3
  • c) -CH3CH2
  • d) -CHR2
0 h : 0 m : 1 s