Q.1
+I effect is shown by ....
  • a) - NO2
  • b) - Cl
  • c) - Br
  • d) -CH3
Q.2
Maximum -I effect is exerted by the group
  • a) C6H5 -
  • b) - OCH3
  • c) Cl
  • d) NO2
Q.3
Assertion: CHF3 is more acidic than CHCl3 Reason: Electron releasing group decreases the acidity while electron withdrawing groups increases the acidity
  • 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.4
Electromeric effect
  • a) comes into play at the emand of attacking reagent
  • b) involves displacement of electrons in a sigma bond
  • c) comes into play in the molecule when at least one atom has unshared pair of electron
  • d) involves the distortion of the electron cloud
Q.5
The reaction intermediate produce by homolytic cleavage of bond is called ... [ CET J and K 2007]
  • a) carbocations
  • b) carbanions
  • c) free radicals
  • d) carbenes
Q.6
Heterolytic fission of carbon-carbon bond produces
  • a) two free radicals
  • b) two carbocations
  • c) two carbanions
  • d) one cation and one anion
Q.7
The most stable carbocation is ...
  • a) methyl carbocation
  • b) primary carbocation
  • c) secondary carbocation
  • d) tertiary carbocation
Q.8
The most stable carbanion is ..
  • a) methyl carbanion
  • b) primary carbanion
  • c) secondary carbanion
  • d) tertiary carbanion
Q.9
A free radical is ....
  • a) shortly lived species
  • b) neutral in nature
  • c) paramagnetic
  • d) all of these
Q.10
The number of electrons, present in the valence shell of carbon of CH3C+H2 ion bering +ve charge, is
  • a) 8
  • b) 7
  • c) 6
  • d) 4
Q.11
The number of electrons, present in the valence shell of carbon of carbanion bearing -ve charge, is ...
  • a) 8
  • b) 7
  • c) 6
  • d) 4
Q.12
The shape of [CH3]+ is ...
  • a) triangular planar
  • b) square planar
  • c) tetrahedral
  • d) none of these
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
  • 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.14
Which of the following statements is wrong?
  • a) A tertiary free radical is more stable than a secondary free radical
  • b) A secondary free radical is more stable than a primary free radical
  • c) A tertiary carbocation is more stable than a secondary carbocation
  • d) A primary carbocation is more stable than a secondary carbocation
Q.15
Most stable carbocation is ...
  • a) CH3 - C+H2
  • b) C+H2CHCl2
  • c) C+H2CH2Cl
  • d) CH3-CH2NO2
Q.16
The shape of carbanion, [CH3]- is :
  • a) linear
  • b) pyramidal
  • c) planar
  • d) tetrahedral
Q.17
In carbocation, the carbon atom bearing the positive charge is :
  • a) sp3 - hybridized
  • b) sp-hybridized
  • c) dsp2 - hybridized
  • d) sp2 - hybridized
Q.18
Which one of the following characteristics belongs to electrophile?
  • a) Electron rich species
  • b) Electron deficient species
  • c) Anionic in nature
  • d) Cationic in nature
Q.19
A nucleophile must have
  • a) a lone pair of electron
  • b) an electron deficient centre
  • c) a negative charge
  • d) a positive charge
Q.20
The follwoing reaction is : C2H5Br + KOH → C2H5OH + KBr
  • a) electrophilic substitution
  • b) elimination
  • c) nucleophilic substitution
  • d) addition
Q.21
Reasonance is due to
  • a) delocalisation of sigma-electrons
  • b) delocalisation of pi-electrons
  • c) migration of H-atoms
  • d) migration of protons
Q.22
which of the following statements is correct about a carbocation?
  • a) It reacts with nuclophile
  • b) It can undergo rearrngement
  • c) It can element an H+ to form an olefin
  • d) All are correct
Q.23
Hyperconjugation is most useful for stabilizing which of the following carbocations?
  • a) neo-Pentyl
  • b) tert-Butyl
  • c) iso- Propyl
  • d) Ethyl
Q.24
Assertion: Free radicals are short lived and highly reactive Reason: Free radicals are highly unstable
  • 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.25
The stability of the following carbocation decreases in the order:
ch-25_que_no-65_img_no1.png
  • a) IV > III > II > I
  • b) IV > II > III > I
  • c) IV > II > I > III
  • d) IV > I > II > III
Q.26
Heterolytic fission of a covalent bond can form
  • a) free radical
  • b) both carbocation and carbanion
  • c) only carbocation
  • d) only carbaion
Q.27
Which behaves both as a nucleophile and electrophile?
  • a) CH3NH2
  • b) CH3
  • c) CH3CN
  • d) CH3Cl
Q.28
Stability order in the following carbocations
ch-25_que_no-68_img_no1.png
  • a) I > IV > III > II
  • b) I > II > III > IV
  • c) III > IV > I > II
  • d) III > II > I > IV
Q.29
Which one of the following carbocations is most stable?
  • a)
    ch-25_qn-69choice_img_no1.png
  • b)
    ch-25_qn-69choice_img_no2.png
  • c)
    ch-25_qn-69choice_img_no3.png
  • d)
    ch-25_qn-69choice_img_no4.png
Q.30
Which of the following contains three pairs of electron?
  • a) Cabocation
  • b) Carbanion
  • c) Free radical
  • d) None of these
0 h : 0 m : 1 s