Q1 The following reaction proceeds
through a
[NET Dec
2013]
(a) 1, 3-sigmatropic
rearrangement
(b) 2, 3-sigmatropic
rearrangement
(c) 3, 3-sigmatropic
rearrangement
(d) 3, 5-sigmatropic
rearrangement
Q2 The major product formed in the
following reaction sequence is
[NET Dec
2013]
(a)
(b)
(c)
(d)
Q3 The number of nodes present in the
highest occupied molecular orbital of 1, 3, 5-hexatriene in its ground state is
[NET Dec
2013]
(a) one
(b) two
(c) three
(d) four
Q4 The conditions A-B required for the
following pericyclic reactions are
[NET Dec
2013]
(a) A-Δ, B-Δ
(b) A-hv, B-Δ
(c) A- hv, B- hv
(d) A-Δ, B- hv
Q5 The number of π electrons
participating and the pericyclic mode in the following reaction are
[NET Dec
2013]
(a) 4 and
conrotatory
(b) 4 and
disrotatory
(c) 6 and
conrotatory
(d) 6 and
disrotatory
Q6 In the Diels-Alder reaction, the
most reactive diene amongst the following is
[NET June
2014]
(a) (4E)-1,4-hexadiene
(b) (4Z)-1,4-hexadiene
(c) (2E, 4E)-2,
4-hexadiene
(d) (2Z, 4Z)-2,
4-hexadiene
Q7 The major product formed in the
following reaction is
[NET June
2014]
(a)
(b)
(c)
(d)
Q8 The correct combination of reagents
for effecting the following sequence of reaction is
[NET June
2014]
(a) A = O3/O2; B =
K+-OOC-N=N-COO-+K, AcOH
(b) A = O2, Rose Bengal, hv;
B = K+-OOC-N=N-COO-+K, AcOH
(c) A = O2, Rose Bengal, hv;
B = H2, Pd/C
(d) A = O2, Rose Bengal, Δ; B = H2, Pd/C
Q9 The correct sequence of pericyclic
reactions involved in the following transformation is
[NET Dec
2016]
(a) (i) ene reaction, (ii) [2,
3]-sigmatropic shift, (iii) [3, 3]-sigmatropic shift
(b) (i) ene reaction, (ii) [3,
3]-sigmatropic shift, (iii) [1, 3]-sigmatropic shift
(c) (i) [2, 3]-sigmatropic shift, (ii) ene
reaction, (iii) [1, 3]-sigmatropic shift
(d) (i) [1, 3]-sigmatropic shift, (ii) [2,
3]-sigmatropic shift, (iii) [3, 3]-sigmatropic shift
Q10 Pericyclic reaction involved in one
of the steps of the following reaction sequence is
[NET June
2014]
(a) [1,
3]-sigmatropic shift
(b) [3, 3]-sigmatropic
shift
(c) [1,
5]-sigmatropic shift
(d) [2,
3]-sigmatropic shift
Q11 The major products A and B in the
following reaction sequence are
[NET June
2014]
(a)
(b)
(c)
(d)
Q12 The reaction of 1-bromo-2-fluorobenzene
with furan in the presence of one equivalent of Mg gives
[NET Dec
2014]
(a)
(b)
(c)
(d)
[NET Dec
2014]
(a)
(b)
(c)
(d)
Q14 The products A and B in the
following reaction sequence are
[NET Dec
2014]
(a)
(b)
(c)
(d)
Q15 The major product of the following
reaction is
[NET Dec
2014]
(a)
(b)
(c)
(d)
Q16 The major product formed in the
following reaction is
[NET June
2015]
(a)
(b)
(c)
(d)
Q17 The major products A and B formed in
the following reactions are
[NET June
2015]
(a)
(b)
(c)
(d)
Q18 The major product in the following
sequence is
[NET June
2015]
(a)
(b)
(c)
(d)
Q19 The major product formed by
photochemical reaction of (2E, 4Z, 6E)-decatriene
[NET Dec 2015]
(a)
(b)
(c)
(d)
Q20 The major product formed in the
following reaction is
[NET Dec
2015]
(a)
(b)
(c)
(d)
Q21. The major product formed in the
following reaction is
[NET Dec
2015]
(a) 
(b)
(c)
(d)
Q22. The following transformation
involves sequential
[NET Dec 2015]
(a) Claisen rearrangement - Cope
rearrangement - ene reaction
(b) Cope rearrangement - Claisen
rearrangement - ene reaction
(c) Cope rearrangement - ene reaction -
Claisen rearrangement
(d) ene reaction - Claisen
rearrangement - Cope rearrangement
Q23. A concerted [1,3]-sigmatropic
rearrangement took place in the reaction shown below. The structure of the
resulting product is
[NET Dec 2015]
(a)
(b)
(c)
(d)
Q24. The following transformation
proceeds through two consecutive electrocyclic processes, which are
[NET June
2016]
(a) 4Ï€ con and
6Ï€ con
(b) 4Ï€ dis and
6Ï€ con
(c) 4Ï€ con and
6Ï€ dis
(d) 4Ï€ dis and
6Ï€ dis
Q25. The correct starting compound A in
the following reaction is
[NET Dec 2016]
(a)
(b)
(c)
(d)
Q26. The major products A and B formed
in the following reaction sequence are
[NET June 2016]
(a)
(b)
(c)
(d)
Ans Key:
Q1-c Q2-b Q3-b Q4-b Q5-d
Q6-c Q7-c Q8-b Q9-a Q10-d
Q11-a Q12-c Q13-c Q14-a Q15-d
Q16-c Q17-b Q18-d Q19-a Q20-a
Q21-c Q22-b Q23-c Q24-c Q25-b Q26-c