PPSC Chemistry Lecturer Preparation (Test # 15)- Malik Xufyan 03137355727

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PPSC CHEMISTRY CLASS
Test Session
Chapter: Structure and Reactivity
Test No. 15
For more WhatsApp # 0313-7355727
Topics:
1- Inductive Effect
2- Delocalized Chemical Bonding
3- Resonance Effect
4- Tautomerism
5- Hyperconjugation
6. Steric Effect
7. Hydrogen Bonding
Inductive Effect
1) Which of the following statement is incorrect about the inductive effect ?
a) It is a permanent effect
b) It decreases with increase in distance from the polar group causing inductive effect.
c) It involves delocalization of π-electrons
d) It involves displacement of σ-electrons
2) The inductive effect can be best described as:
a) the conjugation of σ-bonding orbital with the adjacent π-orbital.
b) the ability of atom or group to cause bond polarization
c) the transfer of lone pair of electrons from more electronegative atom to lesser
electronegative atom in a molecule.
d) All of the above.
3) Which of the following shows positive (+I) inductive effect?
a) – NO2
b) –OCH3
c) –COOH
d) –CH3
4) Which of the following group shows negative (-I) inductive effect ?
a) –CH2CH3
b) –C(CH3)3
c) –C6H5
d) –CH3
5) Which of the following orders is correct regarding the -I effect of the substituents ?
a) –NH2< –OR > –F
b) -CR3 < –NR2< –OR < –F
c) -CR3 > –NR2> –OR > –F
d) –+
NR3 > –+
OR2
6) The correct order with respect to the magnitude of negative inductive effect for the
given groups is:

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a) –SO3H > –SO2R > –SR > –SOR
b) –SR > –SO2R > – SOR > –SO3H
c) –SO3H > –SO2R > –SOR > –SR
d) –SR > –SOR > –SO2R > –SO3H
7) The most stable carbonium ion among the following is:
a) CH3
+
b) CH3CH2
+
c) (CH3)2CH+
d) (CH3)3C+
8) The least stable radical among the following is:
a) CH3• b) CH3CH2• c) (CH3)CH• d) (CH3)3C•
9) The correct order of acidic strength of given acids is:
a) Formic acid > Acetic acid >Propanoic acid
b) Formic acid > Acetic acid <Propanoic acid
c) Formic acid < Acetic acid >Propanoic acid
d) Formic acid < Acetic acid <Propanoic acid
10) The correct order of acidic strength is:
a) CH3CH2CHFCOOH > CH3CHFCH2COOH > FCH2CH2CH2COOH
b) CH3CH2CHFCOOH < CH3CHFCH2COOH < FCH2CH2CH2COOH
c) CH3CH2CHFCOOH > CH3CHFCH2COOH < FCH2CH2CH2COOH
d) CH3CH2CHFCOOH < CH3CHFCH2COOH > FCH2CH2CH2COOH
11) Which of the following is strongest acid ?
a) Cl3CCOOH
b) Cl2CHCOOH
c) ClCH2COOH
d) CH3COOH
12) Which of the following carbanion is more stable ?
a) CH3
-
b) CH3CH2
-
c) CF3CH2
-
d) (CH3)2CH-
13) Identify the correct sequence with respect to Inductive effects.
a) CF3`> CH2F`> CHF2`> CF3`
b) CF3`> CHF2`> CH2F`> CH3`
c) CH3`> CH2F`> CHF2`> CF3`
d) CH3`> CHF2`> CH2F`v CF3`
14) What is the %s character in hybridization of carbon when it shows strongest -I
effect ?
a) 25% b) 50% c) 75% d) 66.6%
15) Which of the following orders is correct regarding the acidity of carboxylic acids ?
a) (CH3)3CCOOH > (CH3)2CHCOOH > CH3CH2COOH
b) (CH3)3CCOOH > (CH3)2CHCOOH < CH3CH2COOH
c) (CH3)3CCOOH < (CH3)2CHCOOH > CH3CH2COOH
d) (CH3)3CCOOH < (CH3)2CHCOOH < CH3CH2COOH
16) The strongest Lewis base among the following is :
a) CH3NH2
b) (CH3)2NH
c) (CH3)3N
d) C6H5NH2
17) Identify the correct statements about the electronegativity of groups given below

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a) CF3 group has greater value than that of NF2
b) NH2 group has lower value than that of NF2
c) OH group has greater value than that of NF2
d) CH3 and C2H5 groups have almost similar values
Correct answer is
1) a, b and d
2) b and c
3) b, c and d
4) b and d
18) Which of the following is an incorrect statement about inductive effect?
A) The electron-withdrawing inductive effect (-I) of a group weakens the O-H bond in -
COOH and favours ionisation of a carboxylic acid
B) It operates through space.
C) Aniline is a weaker base than ammonia due to negative inductive effect shown by the
phenyl group.
D) Alkyl groups are good examples of positive inductive effect.
19) Choose the correct statement regarding inductive effect.
a) It is strengthened with increase in distance from the atom or group causing polarization.
b) Involves displacement of a lone pair.
c) Involves delocalization of pi electrons.
d) It operates through σ-bonds.
20) Which of the following groups has highest inductive effect.
a) Cl
b) Br
c) F
d) I
21) Which of the following group shows electron withdrawing inductive effect ?
a) –CH2CH3
b) – NO2
c) –C6H5
d) –CH3
22) Inductive effect in molecule arises due to :
a) presence of a non-polar bond
b) polarization of a sigma bond adjacent to either an electron withdrawing or electron
releasing group.
c) delocalization of π-electrons
d) delocalization of sigma electrons.
23) Which of the following effect can destabilize the 3o butyl carboanion? :
a) positive inductive effect
b) negative inductive effect.
c) neutral inductive effect
d) None of the above.
Delocalization and Resonance

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24) Resonance forms are in equilibrium with each other.
a) True
b) False
25) Identify the false statement regarding resonance.
a) As the number of charges increases, the resonance forms gets more significant
b) Zero charge of resonance is the most significant one
c) Atoms with full octet resonance form are more stable when compared with the one with
unfilled octet
d) Resonance is unstable in case of unfilled octet of nitrogen atom
26) Identify the correct sequence according to electronegativity.
a) F > NH2 > CH3 >OH`
b) NH2 `> F` >CH3` > OH`
c) NH2 `> OH` > CH3` > F`
d) F` > OH` > NH2` > CH3`
27) Stability sequence: primary carbocation > secondary carbocation > tertiary
carbocation. Is this sequence correct?
a) Yes
b) No
28) Identify the incorrect statement regarding aromaticity.
a) It is the extra stability possessed by a molecule
b) p-orbitals must be planar and overlap
c) Cyclic delocalization takes place
d) It does not follow Huckel’s rule
29) Aromatic rings do not have resonance structures.
a) False
b) True
30) Select the correct statement regarding the aromatic nitrogen molecule.
a) It is not hybridized
b) It is sp hybridized
c) It is sp2 hybridized
d) It is sp3 hybridized
31) Can a linear molecule have aromaticity.
a) Yes
b) No
32) Select the incorrect statement.
a) A resonance may sometimes cause sp3 atoms to become sp2 hybridized
b) Delocalizing one lone pair causes aromaticity
c) One lone pair will be counted as two pi electrons according to Huckel’s equation
d) Two sigma bonds make up a double bond
33) In mesomeric effect, the electrons are transferred from ____
a) A multiple bonds to an atom
b) A multiple bonds to a single covalent bond
c) An atom with a lone pair to the adjacent single covalent bond
d) All of the mentioned

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34) Which of the following is a resonance effect?
a) Inductive effect
b) Electromeric effect
c) Mesomeric effect
d) Inductomeric effect
35) The phenomenon in which 2 or more structures, involving identical position of
atoms can be written for a particular molecule, is called ____
a) Conjugation
b) Resonance
c) Hyper conjugation
d) Vibration
36) Select the incorrect option from the following option.
a) Resonating structures have a real existence
b) The actual structure lies between various possible resonating structures
c) Resonating structures are useful as they allow us to describe molecules
d) None of the mentioned
37) The resonance energy is defined as a difference in energy between ____
a) Two consecutive resonating structures
b) Resonance hybrid and most unstable resonating structure
c) Resonance hybrid and most stable resonating structure
d) First and last resonating structures
38) Which of the following is an application of the mesomeric effect?
a) Dipole moment
b) Strength of acids and bases
c) Bond length
d) All of the mentioned
39) Dipole moment of CH3-CH2-Cl > CH2=CH-Cl.
a) True
b) False
Hypercojugation
40) Select the correct statement from the following option.
a) Benzene ring has two different types of bond length for single and double bonds
b) All the bond length in benzene ring is equal due to hyperconjugation
c) All the bond length in benzene ring is equal due to resonance
d) All of the mentioned
41) Greater the number of resonating structures for a given intermediate ____
a) Less will be its stability
b) More will be its stability
c) It will not affect its stability
d) None of the mentioned
42) Phenyl group show ____
a) (+M) effect
b) (+E) effect

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c) (+I) effect
d) (-M) effect
43) Which of the following is known as Baker-Nathan effect?
a) Mesomeric effect
b) Inductive effect
c) Hyperconjugation
d) Electromeric effect
44) Hyperconjugation involves the delocalisation of __________
a) σ bond orbital
b) π bond orbital
c) Both σ and π bond orbital
d) None of the mentioned
45) Number of hyperconjugation structures in isopropyl radical is __________
a) 3
b) 6
c) 9
d) 12
46) The resonance energy (kCal/mol) of tertiary butyl is __________
a) 9
b) 10
c) 11
d) 12
47) Larger the number of hyperconjugation structures, the stability of free radicals will
__________
a) Increase
b) Decrease
c) Remains same
d) None of the mentioned
48) Which of the following is a consequence of Baker-Nathan effect?
a) It is helpful in explaining the directive influence of alkyl groups in aromatic alkyl benzene
b) It is helpful in explaining the relative stability of alkenes
c) It is helpful in explaining the relative stabilities of alkyl carbocations
d) All of the mentioned
49) On increasing the number of α-hydrogens, the number of hyperconjugation
structures will __________
a) Decrease
b) Increase
c) Remains same
d) None of the mentioned
50) When the contributing structure contains the same number of two-electron bonds as
the normal lewis formula, it will be __________
a) Heterovalenthyperconjugation
b) Sacrificial hyperconjugation

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c) Isovalenthyperconjugation
d) All of the mentioned
51) The compound that can be most readily sulphonated is __________
a) Benzene
b) Toluene
c) Nitrobenzene
d) Chlorobenzene
52) Ethene is devoid of any alpha hydrogen so hyperconjugation is not possible.
a) True
b) False
Tautomerism
53) How many enolisable hydrogens are there in the following compound?
a) 4
b) 5
c) 6
d) 7
54) How many tautomers can you draw for the following ketone?
a) 1
b) 2
c) 3
d) 4
55) How many tautomers can you draw for the following ketone?
a) 1
b) 2

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c) 3
d) 4
56) Which of the following is a tautomer of phenol?
a)
b)
c)
d)
57) Which of the following compound exhibit tautomerism?
a) I
b) II
c) I and II
d) Neither I nor II
58) In keto-enol from presence of which type of hydrogen is must?
a) Alpha
b) Beta
c) Gamma
d) Any position of hydrogen
59) Which of the following tautomeric form is more stable?
CH3-CH=O ↔ CH2=C-OH
(I) (II)

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a) I
b) II
c) Both are equally stable
d) Both are unstable
60) What is the stability order for the following compounds?
a) I > II > III
b) II > I > III
c) III > II >I
d) I > III > II
61) Which of the following structure can show tautomerism?
a) I
b) II
c) III
d) I and III
Steric effect
62) Steric hindrance is the slowing of chemical reactions due to
a) Bulky groups
b) Mesomeric effect
c) Delocalization
d) None
63)Which of the following is a tertiary halogenoalkane?
a) 2-Chloropropane.
b) 1-Chloropropane.
c) 1-Chloro-2-methylpropane.
d) 2-Chloro-2-methylpropane.
64) Steric effect of cyclohexanone will be ______ than methyl ketone?
a) less
b) more
c) equal
d) none
65) N-N dimethyl aniline is more stable than 2,2-dimethyl anilin, this statement is?

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a) False
b) True
Hydrogen Bonding
66) The covalent bond is stronger than Hydrogen bonding about
a) thirty times
b) sixty times
c) twenty times
d seventy times
67) Hydrogen can behave as a metal
a) at very high temperature
b) at very low temperature
c) at very high pressure
d) at very low pressure
68) Which of the following compounds would be expected to have the highest melting
point?
a) BaF2
b) BaCl2
c) BaBr2
d) BaI2
e) H2O
69) Nitrogen, fluorine and oxygen are _____ in nature.
a) electronegative
b) electropositive
c) metallic
d) semi-metallic
70) Which bond acts like a bridge two molecules formed by a covalent bond?
a) Covalent bond
b) Ionic bond
c) Hydrogen bond
d) Metallic bond
71) A molecule named o-nitrophenol consists of ______hydrogen bond/s.
a) intermolecular
b) intramolecular
c) both intermolecular and intramolecular
d) neither intermolecular nor intramolecular
72) Water molecules contain _____ hydrogen bond/s.
a) intermolecular
b) intramolecular
c) both intermolecular and intramolecular
d) neither intermolecular nor intramolecular
73) The magnitude of the H-bonding depends on the _____ of the compound.
a) surroundings
b) system

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c) atmosphere
d) physical state
74) Which of the following molecule can form a hydrogen bond with hydrogen?
a) Sodium
b) Oxygen
c) Aluminum
d) Rubidium
75) Which of the following molecules doesn’t involve hydrogen bond formation?
a) H2O
b) O-nitrophenol
c) NaCl
d) HF