ORGANIC CHEMISTRY : MS CHOUHAN & TEAM TIME : 35 MIN.
DPP-81
1. Hyperconjugation is possible in
(A) alkenes (B) alkynes (C) carbocations (D) all of these
2. Hyperconjugation is possible in
(A) Free radicals (B) Carbanions (C) Alcohols (D) Amines
3. Hyperconjugation occurs in
(A) CH3–CH=CH2 (B) CH3–CH2–CH=CH2 (C) (D) all of these
4. Hyperconjugation occurs in
(A) (B) CH3–CH=CH–CH3 (C) Ph–CH=CH2 (D) CH3
5. Hyperconjugation occurs in
(A) (B) (C) (D)
6. Hyperconjugation occurs in
CH2
(A) (B)
(C) (D) all of these
7. Hyperconjugation occurs in
(A) C H3 (B) CH3 – C H2 (C) (D) both (B) and (C)
8.
How many hyperconjugable H-atoms does this alkene has?
(A) 10 (B) 6 (C) 12 (D) 15
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 1
9.
How many hyperconjugable H-atoms does this radical has?
(A) 5 (B) 6 (C) 12 (D) 8
10.
Canonical structures due to hyperconjugation in this molecule can be written as
HB HA HA
–
O –
O –
O
(A) C = CH – CH2 C = CH – CH2 C = CH – CH2
HC HO
A HC O
HB HB HO
C
HB HA HA
O O O
(B) C = CH – CH2 C = CH – CH2 C = CH – CH2
–
HC –
HO
A
HC –
O
HB HB HCO
(C) both (A) and (B) (D) none of these
CH3 CH3 CH3
11.
CH3 CH3 CH3
(I) (II) (III)
Among these compounds, which of the following orders is correct for their nobond-resonance energy?
(A) III > II > I (B) I > II > III (C) I > III > II (D) II > III > I
12. Compound Homolytic bond
dissociation energy
CH4 C H3 H 104 Kcal/mol
92 Kcal/mol
Notice the homolytic bond-dissociation energy of the alkanes. Now, ignoring the contribution of inductive
effect, no-bond-resonance energy of tert-butyl radical can be calculated to be
(A) 6 Kcal/mol (B) 10 Kcal/mol (C) 12 Kcal/mol (D) 14 Kcal/mol
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 2
13.
Among these cycloalkenes, which of the following orders of stability is correct?
(A) I > II > III (B) III > II > I (C) II > I > III (D) II > III > I
14.
Among these dienes, which of the following orders of stability is correct?
(A) I > II > III (B) III > II > I (C) II > III > I (D) II > I > III
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 3
ANSWER KEY
1. D 2. A 3. D 4. B 5. B
6. C 7. D 8. A 9. A 10. A
11. A 12. C 13. D 14. B
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 4
ORGANIC CHEMISTRY : MS CHOUHAN & TEAM TIME : 35 MIN. DPP-82
1.
Which of the following statements is correct, about these cycloalkenes?
(A) Stability difference between I and II is more than that between III and IV
(B) Stability difference between I and II is less than that between III and IV
(C) Overall, stability order is I > II > III > IV
(D) none of these
2.
CH2 CH – C C – CH CH2
II
Which of the following orders is correct for heat of combustion of these isomers?
(A) I > II (B) II > I (C) I = II (D) Not predictable
3.
Which of the following order is correct for heat of combustion of these isomers?
(A) I > II > III (B) III > II > I (C) II > III > I (D) I > III > II
4.
Which of the following orders is correct for heat of hydrogenation of these compounds?
(A) I > II > III (B) III > II > I (C) II > I > III (D) I > III > II
5.
Which of the following orders is correct for heat of hydrogenation of these compounds?
(A) I > II > III (B) III > II > I (C) III > I > II (D) II > III > I
6.
Which of the following orders is correct for heat of hydrogenation of these compounds?
(A) I > II > III (B) III > II > I (C) II > III > I (D) I > III > II
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 5
7.
Which of the following orders is correct for heat of hydrogenation of these compounds?
(A) I > II > III (B) III > II > I (C) II > I >III (D) III > I > II
CH3
CH3 CH2
8.
I II
III
Which of the following orders is correct for heat of hydrogenation of these compounds?
(A) I > II > III (B) III > II > I (C) III > I > II (D) II > I > III
CH3
9.
CH3
III
Which of the following order is correct for heat of hydrognenation of these compounds?
(A) I > II > III (B) III > II > I (C) II > III > I (D) III > I > II
CH3
a b
10.
CH3
a and b are the length of these two C=C bonds. Now, which of the following orders is correct?
(A) a = b (B) a > b (C) b > a (D) Not predictable
CH3
a b c
11.
CH3
a, b and c are the length of these C=C bonds. Now, which of the following orders is correct?
(A) a = b = c (B) a > b > c (C) c > b > a (D) b > c > a
12. Inductive effect of -NO2 group operates in
(A) (B) (C) (D) all of these
13. Inductive effect of -CH3 group operates in
CH3 CH3 CH3
(A) (B) (C) (D) both (B) and (C)
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 6
14.
Which of these gorups has +I effect?
(A) I (B) II (C) III (D) all of these
15.
Hybridization of the negatively charged C-atom of this anion is
(A) sp3 (B) sp2 (C) sp (D) unhybridized
16.
Which of the following orders is correct for heat of combustion of these isomeric alkenes?
(A) I > II > III (B) III > II > I (C) III > I > II (D) II > III > I
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 7
ANSWER KEY
1. A 2. B 3. C 4. A 5. D
6. C 7. A 8. A 9. C 10. C
11. C 12. D 13. D 14. D 15. B
16. D
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 8
ORGANIC CHEMISTRY : MS CHOUHAN & TEAM TIME : 35 MIN. DPP-83
1.
Empty orbital of this carbocation is
(A) 2p (B) sp3 (C) sp2 (D) sp
2. Negative charge of which of the following carbanions is not resonance-stabilized?
(A) (B) (C) (D)
3.
Which of the following orders is correct for the stability of these carbocations?
(A) I > II > III (B) III > II> I (C) I > III > II (D) II > III > I
4.
Which of the following orders is correct for the stability of these carbocations?
(A) I > II > III (B) III > II > I (C) II > I > III (D) II > III > I
5.
Which of the following orders is correct for the stability of these carbocations?
(A) I > II > III (B) III > II > I (C) II > I > III (D) II > III > I
6.
Which of the following orders is correct for the stability of these carbocations?
(A) I > II > III (B) III > II > I (C) I > III > II (D) II > I > III
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 9
7.
Which of the following orders is correct for the stability of these carbanions?
(A) I > II > III (B) III > II > I (C) II > I > III (D) I II III
O–
CH2
8.
III
Which of the following orders is correct for the stability of these carbanions?
(A) I > II > III (B) III > II > I (C) II > III > I (D) II > I > III
–
O –
O –
O
(I) (II) (III)
9.
CH3 Cl
Which of the following orders is correct for the stability of these carbanions?
(A) I > II > III (B) III > II > I (C) III > I > II (D) II > III > II
–
O –
O –
O
Cl
10. (I) (II) (III)
Cl
Cl
Which of the following orders is correct for the stability of these carbanions?
(A) I > II > III (B) III > II > I (C) II > I > III (D) II > III > I
“Every great man tasted the bitter pills of
failure but they never swallowed them.”
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 10
ANSWER KEY
1. C 2. C 3. A 4. C 5. B
6. C 7. A 8. B 9. C 10. A
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 11
ORGANIC CHEMISTRY : MS CHOUHAN & TEAM TIME : 35 MIN. DPP-84
1. In each of the following groups of compounds, identify the one with the largest heat of combustion and the
one with the smallest. In which cases can a comparison of heats of combustion be used to assess relative
stability ?
(a) Cyclopropane, cyclobutane, cyclopentane
(b) cis-1,2-Dimethylcyclopentane, methylcyclohexane, 1,1,2,2-tetramethylcyclopropane
(c)
H H
H
(d)
H H H
2. Write a balanced chemical equation for the combustion of each of the following compounds :
(a) Decane
(b) Cyclodecane
(c) Methylcyclononane
(d) Cyclopentylcyclopentane
3. In each of the following groups of compounds, identify the one with the largest heat of combustion and the
one with the smallest. (Try to do this problem without consulting Table).
(a) Hexane, heptane, octane
(b) Isobutane, pentane, isopentane
(c) Isopentane, 2-methylpentane, neopentane
(d) Pentane, 3-methylpentane, 3,3-dimethylpentane
(e) Ethylcyclopentane, ethylcyclohexane, ethylcycloheptane
4. Match each alkene with the appropriate heat of combustion :
Compound Heats of combustion (kJ/mol)
(a) 1-Heptene (p) 5293
(b) 2,4-Dimethyl-1-pentene (q) 4658
(c) 2,4-Dimethyl-2-pentene (r) 4650
(d) (Z)-4,4-Dimethyl-2-pentene (s) 4638
(e) 2,4,4-Trimethyl-2-pentene (t) 4632
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 12
5. Choose the more stable alkene in each of the following pairs Explain your reasoning.
(a) 1-Methylcyclohexene or 3-methylcyclohexene
(b) Isopropenylcyclopentane or allylcyclopentane
(c) or
Bicyclo[4.2.0]oct-7-ene Bicyclo[4.2.0]oct-3-ene
(d) (Z)-Cyclononene or (E)-cyclonoene
(e) (Z)-Cyclooctadecene or (E)-cyclooctadecene
6. (a) Suggest an explanation for the fact that 1-methylcyclopropene is some 42 kJ/mol (10 kcal/mol) less
stable than methylenecyclopropane.
(b) On the basis of your answer to part (a), compare the expected stability of 3-methyl-cyclopropene with
that of 1-methylcyclopropene and that of methylenecyclopropane.
7. What three alkenes yield 2-methylbutane on catalytic hydrogenation ?
8. Match the following alkenes with the appropriate heats of hydrogenation :
Compound Heats of hydrogenation in kJ/mol :
(a) 1-Pentene (p) 151
(b) (E)-4,4-Dimethyl-2-pentene (q) 122
(c) (Z)-4-Methyl-2-pentene (r) 114
(d) (Z)-2,2,5,5-Tetramethyl-3-hexene (s) 111
(e) 2,4-Dimethyl-2-pentene (t) 105
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 13
ANSWER KEY
1. (a) c > b > a (b) c > a > b (c) b > a > c (d) b > c > a
y y
2. CxHy + x O2 x CO2 + H2O
4 2
3. (a) c > b > a (b) b > c > a (c) b > a > c (d) c > b > a (e) c > b > a
4. (a) q, (b) s, (c) t, (d) r, (e) p
5. (a) a > b (b) a > b (c) b > a (d) Z > E (e) E > Z
6. (a) -bond in 3-memberd ring is unstable (b) Stability order : 3 > 2 > 1
7.
8. (a) q, (b) r, (c) s, (d) p, (e) t
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 14
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 15
For more update follow us on :
M S chouhan - NEET & JEE - Kota ms_chouhan_msc_sir M S Chouhan (msc sir) M S Chouhan
Join with code VIBRANTLIVE for 10% discount on your subscription. 16
