Some Basic Principles & Techniques Practice Questions - DPP for JEE

 Page 1


PART-I (Single Correct MCQs)
1. The IUPAC name of
(a) 1- hydroxy -4- methyl -3- pentanone
(b) 2- methyl -5- hydroxy -3- pentanone
(c) 4- methyl -3- oxo -1- pentanol
(d) Hexanol -1 - one -3
2. The prussian blue colour obtained in the Lassaigne’s test for nitrogen is
due to the formation of
(a) Iron (II) hexacyanoferrate (III)
(b) Iron (III) hexacyanoferrate (II)
(c) Iron (III) hexacyanoferrate (III)
(d) Iron (II) hexacyanoferrate (II)
3. Which one of the following orders is correct regarding the –I effect of
Page 2


PART-I (Single Correct MCQs)
1. The IUPAC name of
(a) 1- hydroxy -4- methyl -3- pentanone
(b) 2- methyl -5- hydroxy -3- pentanone
(c) 4- methyl -3- oxo -1- pentanol
(d) Hexanol -1 - one -3
2. The prussian blue colour obtained in the Lassaigne’s test for nitrogen is
due to the formation of
(a) Iron (II) hexacyanoferrate (III)
(b) Iron (III) hexacyanoferrate (II)
(c) Iron (III) hexacyanoferrate (III)
(d) Iron (II) hexacyanoferrate (II)
3. Which one of the following orders is correct regarding the –I effect of
the substituents ?
(a) —NR
2
 <—OR >—F
(b) —NR
2
 > —OR >—F
(c) —NR
2
 <—OR <—F
(d) —NR
2
 >—OR <—F
4. Vinylcarbinol is
(a) HO–CH
2
–CH=CH
2
(b) CH
3
C(OH)=CH
2
(c) CH
3
–CH=CH–OH
(d) CH
3
–C(CH
2
OH)= CH
2
5. Which of the following is true regarding hyperconjugation, also known
as no-bond resonance?
(i) Like inductive effect it involves donation of electrons through s bonds.
(ii) Hyperconjugation involves overlapping of filled orbitals with the empty
p orbital of the carbocation.
(iii) Like resonance, it involves displacement of p or lone pair of electrons to
the carbon bearing positive charge.
(iv) It involves delocalisation of s and p- electrons.
(a) (ii) and (iv)
(b) (ii)
(c) (iii)
(d) none
6. The accepted IUPAC name of the camphor is
(a) 1, 7, 7 – trimethyl bicyclo [2. 2. 1] heptan – 2 – one
(b) 1, 7, 7, – trimethyl bicyclo [2. 1. 2] heptan – 2 – one
(c) 1, 2, 2 – trimethyl bicyclo [2. 2. 1] heptan – 6 – one
(d) None of these
7. The stability of the compounds
Page 3


PART-I (Single Correct MCQs)
1. The IUPAC name of
(a) 1- hydroxy -4- methyl -3- pentanone
(b) 2- methyl -5- hydroxy -3- pentanone
(c) 4- methyl -3- oxo -1- pentanol
(d) Hexanol -1 - one -3
2. The prussian blue colour obtained in the Lassaigne’s test for nitrogen is
due to the formation of
(a) Iron (II) hexacyanoferrate (III)
(b) Iron (III) hexacyanoferrate (II)
(c) Iron (III) hexacyanoferrate (III)
(d) Iron (II) hexacyanoferrate (II)
3. Which one of the following orders is correct regarding the –I effect of
the substituents ?
(a) —NR
2
 <—OR >—F
(b) —NR
2
 > —OR >—F
(c) —NR
2
 <—OR <—F
(d) —NR
2
 >—OR <—F
4. Vinylcarbinol is
(a) HO–CH
2
–CH=CH
2
(b) CH
3
C(OH)=CH
2
(c) CH
3
–CH=CH–OH
(d) CH
3
–C(CH
2
OH)= CH
2
5. Which of the following is true regarding hyperconjugation, also known
as no-bond resonance?
(i) Like inductive effect it involves donation of electrons through s bonds.
(ii) Hyperconjugation involves overlapping of filled orbitals with the empty
p orbital of the carbocation.
(iii) Like resonance, it involves displacement of p or lone pair of electrons to
the carbon bearing positive charge.
(iv) It involves delocalisation of s and p- electrons.
(a) (ii) and (iv)
(b) (ii)
(c) (iii)
(d) none
6. The accepted IUPAC name of the camphor is
(a) 1, 7, 7 – trimethyl bicyclo [2. 2. 1] heptan – 2 – one
(b) 1, 7, 7, – trimethyl bicyclo [2. 1. 2] heptan – 2 – one
(c) 1, 2, 2 – trimethyl bicyclo [2. 2. 1] heptan – 6 – one
(d) None of these
7. The stability of the compounds
   
(a) (iv) > (iii) > (i) > (ii)
(b) (i) > (iii) > (ii) > (iv)
(c) (ii) > (iii) > (i) > (iv)
(d) (iv) > (i) > (iii) > (ii)
8. The reason for the loss of optical activity of lactic acid when OH group
is changed by H is that :
(a) Chiral centre of the molecule is destroyed.
(b) Molecule acquires asymmetry.
(c) Due to change in configuration.
(d) Structural change occurs.
9.
Hydrogenation of the above compound in the presence of poisoned palladium
catalyst gives
(a) optically active compound
(b) an optically inactive compound
(c) a racemic mixture
(d) a diastereomeric mixture
10. Base strength of :
(A) ,     (B)    and     (C)   
is in the order of :
(a) (B) > (A) > (C)
(b) (C) > (B) > (A)
(c) (A) > (C) > (B)
(d) (A) > (B) > (C)
11. Which of the following biphenyls is optically active ?
Page 4


PART-I (Single Correct MCQs)
1. The IUPAC name of
(a) 1- hydroxy -4- methyl -3- pentanone
(b) 2- methyl -5- hydroxy -3- pentanone
(c) 4- methyl -3- oxo -1- pentanol
(d) Hexanol -1 - one -3
2. The prussian blue colour obtained in the Lassaigne’s test for nitrogen is
due to the formation of
(a) Iron (II) hexacyanoferrate (III)
(b) Iron (III) hexacyanoferrate (II)
(c) Iron (III) hexacyanoferrate (III)
(d) Iron (II) hexacyanoferrate (II)
3. Which one of the following orders is correct regarding the –I effect of
the substituents ?
(a) —NR
2
 <—OR >—F
(b) —NR
2
 > —OR >—F
(c) —NR
2
 <—OR <—F
(d) —NR
2
 >—OR <—F
4. Vinylcarbinol is
(a) HO–CH
2
–CH=CH
2
(b) CH
3
C(OH)=CH
2
(c) CH
3
–CH=CH–OH
(d) CH
3
–C(CH
2
OH)= CH
2
5. Which of the following is true regarding hyperconjugation, also known
as no-bond resonance?
(i) Like inductive effect it involves donation of electrons through s bonds.
(ii) Hyperconjugation involves overlapping of filled orbitals with the empty
p orbital of the carbocation.
(iii) Like resonance, it involves displacement of p or lone pair of electrons to
the carbon bearing positive charge.
(iv) It involves delocalisation of s and p- electrons.
(a) (ii) and (iv)
(b) (ii)
(c) (iii)
(d) none
6. The accepted IUPAC name of the camphor is
(a) 1, 7, 7 – trimethyl bicyclo [2. 2. 1] heptan – 2 – one
(b) 1, 7, 7, – trimethyl bicyclo [2. 1. 2] heptan – 2 – one
(c) 1, 2, 2 – trimethyl bicyclo [2. 2. 1] heptan – 6 – one
(d) None of these
7. The stability of the compounds
   
(a) (iv) > (iii) > (i) > (ii)
(b) (i) > (iii) > (ii) > (iv)
(c) (ii) > (iii) > (i) > (iv)
(d) (iv) > (i) > (iii) > (ii)
8. The reason for the loss of optical activity of lactic acid when OH group
is changed by H is that :
(a) Chiral centre of the molecule is destroyed.
(b) Molecule acquires asymmetry.
(c) Due to change in configuration.
(d) Structural change occurs.
9.
Hydrogenation of the above compound in the presence of poisoned palladium
catalyst gives
(a) optically active compound
(b) an optically inactive compound
(c) a racemic mixture
(d) a diastereomeric mixture
10. Base strength of :
(A) ,     (B)    and     (C)   
is in the order of :
(a) (B) > (A) > (C)
(b) (C) > (B) > (A)
(c) (A) > (C) > (B)
(d) (A) > (B) > (C)
11. Which of the following biphenyls is optically active ?
(a) (b)
(c)
(d)
12. Which of the following compounds does not show Lassaigne’s test for
nitrogen ?
(a) Urea
(b) Hydrazine
(c) Phenylhydrazine
(d) Azobenzene
13. The correct statement regarding the comparison of staggered and
eclipsed conformation of ethane, is
(a) The staggered conformation of ethane is less stable than eclipsed
conformation, because staggered conformation has torsional strain.
(b) The eclipsed conformation of ethane is more stable than staggered
conformation, because eclipsed conformation has no torsional
strain.
(c) The eclipsed conformation of ethane is more stable than staggered
conformation even though the eclipsed conformation has torsional
strain.
(d) The staggered conformation of ethane is more stable than eclipsed
conformation, because staggered conformation has no torsional
strain.
Page 5


PART-I (Single Correct MCQs)
1. The IUPAC name of
(a) 1- hydroxy -4- methyl -3- pentanone
(b) 2- methyl -5- hydroxy -3- pentanone
(c) 4- methyl -3- oxo -1- pentanol
(d) Hexanol -1 - one -3
2. The prussian blue colour obtained in the Lassaigne’s test for nitrogen is
due to the formation of
(a) Iron (II) hexacyanoferrate (III)
(b) Iron (III) hexacyanoferrate (II)
(c) Iron (III) hexacyanoferrate (III)
(d) Iron (II) hexacyanoferrate (II)
3. Which one of the following orders is correct regarding the –I effect of
the substituents ?
(a) —NR
2
 <—OR >—F
(b) —NR
2
 > —OR >—F
(c) —NR
2
 <—OR <—F
(d) —NR
2
 >—OR <—F
4. Vinylcarbinol is
(a) HO–CH
2
–CH=CH
2
(b) CH
3
C(OH)=CH
2
(c) CH
3
–CH=CH–OH
(d) CH
3
–C(CH
2
OH)= CH
2
5. Which of the following is true regarding hyperconjugation, also known
as no-bond resonance?
(i) Like inductive effect it involves donation of electrons through s bonds.
(ii) Hyperconjugation involves overlapping of filled orbitals with the empty
p orbital of the carbocation.
(iii) Like resonance, it involves displacement of p or lone pair of electrons to
the carbon bearing positive charge.
(iv) It involves delocalisation of s and p- electrons.
(a) (ii) and (iv)
(b) (ii)
(c) (iii)
(d) none
6. The accepted IUPAC name of the camphor is
(a) 1, 7, 7 – trimethyl bicyclo [2. 2. 1] heptan – 2 – one
(b) 1, 7, 7, – trimethyl bicyclo [2. 1. 2] heptan – 2 – one
(c) 1, 2, 2 – trimethyl bicyclo [2. 2. 1] heptan – 6 – one
(d) None of these
7. The stability of the compounds
   
(a) (iv) > (iii) > (i) > (ii)
(b) (i) > (iii) > (ii) > (iv)
(c) (ii) > (iii) > (i) > (iv)
(d) (iv) > (i) > (iii) > (ii)
8. The reason for the loss of optical activity of lactic acid when OH group
is changed by H is that :
(a) Chiral centre of the molecule is destroyed.
(b) Molecule acquires asymmetry.
(c) Due to change in configuration.
(d) Structural change occurs.
9.
Hydrogenation of the above compound in the presence of poisoned palladium
catalyst gives
(a) optically active compound
(b) an optically inactive compound
(c) a racemic mixture
(d) a diastereomeric mixture
10. Base strength of :
(A) ,     (B)    and     (C)   
is in the order of :
(a) (B) > (A) > (C)
(b) (C) > (B) > (A)
(c) (A) > (C) > (B)
(d) (A) > (B) > (C)
11. Which of the following biphenyls is optically active ?
(a) (b)
(c)
(d)
12. Which of the following compounds does not show Lassaigne’s test for
nitrogen ?
(a) Urea
(b) Hydrazine
(c) Phenylhydrazine
(d) Azobenzene
13. The correct statement regarding the comparison of staggered and
eclipsed conformation of ethane, is
(a) The staggered conformation of ethane is less stable than eclipsed
conformation, because staggered conformation has torsional strain.
(b) The eclipsed conformation of ethane is more stable than staggered
conformation, because eclipsed conformation has no torsional
strain.
(c) The eclipsed conformation of ethane is more stable than staggered
conformation even though the eclipsed conformation has torsional
strain.
(d) The staggered conformation of ethane is more stable than eclipsed
conformation, because staggered conformation has no torsional
strain.
14. The most suitable method of separation of 1 : 1 mixture of ortho and
para-nitrophenols is :
(a) Chromatography
(b) Crystallisation
(c) Steam distillation
(d) Sublimation
15. Chlorine in vinyl chloride is less reactive because
(a) sp
2
 - hybridised carbon has more acidic character than sp
3
 - hybridised
carbon
(b) C - Cl bond develops partial double  bond character
(c) of  resonance
(d) All are correct
16. Which of the following sequence of T and F is correct for given
statements. Here T stands for correct and F stands for false statement
(i) The more the number of contributing structures, the more is the
resonance energy.
(ii) The resonance structures have different positions of nuclei but same
number of unpaired electrons.
(iii) The energy of actual structure of the molecule (the resonance hybrid) is
lower than that of any of the canonical structures.
(a) TTT
(b) TFT
(c) FFF
(d) TFF
17. Which of the following compounds undergoes nucleophilic substitution
reaction most easily ?
(a)