Pericyclic Reaction MCQ Assignment for CSIR NET
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) 4π con and 6π con
(b) 4π dis and 6π con
(c) 4π con and 6π dis
(d) 4π dis and 6π 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
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