Data
20. in diels alder reaction there is formation of
a. cyclic structure
b. acyclic structure
c. cyclic and acyclic
d. none of these
Correct Option: a
21. In electrophilic substitution reaction, there is distribution of charge on ring
a. both charge
b. positive charge
c. negative charge
d. no charge
Correct Option: b
22. In Ene reaction transfer of hydrogen will be from
a. C2 TO C5
b. C1 to C5
c. C 5 TO C2
d. C3 TO C2
Correct Option: b
23. in friedal craft hologination, main electrophilic reagent to attack is
a. Br+
b. Br-
c. Br2
d. none of these
Correct Option: a
24. in micheal rection strong nucleophile cause
a. 1,5 addition
b. 1, 2 addition
c. 1,4 addition
d. 1,3 addition
Correct Option: b
25. In perkin reaction, product is
a. acyclic product
b. cinnamic acid
c. alpha-beta halo ester
d. cyclic product
Correct Option: b
26. in perkin reaction, reagent involved are alpha-beta unsaturated carbonly and
a. ketone
b. ester
c. acetic anhydride
d. aldehyde
Correct Option: c
27. In sulphonation, main reagent for reaction to proceed is
a. NO2
b. NO3
c. SO3
d. H2SO4
Correct Option: c
28. in the presence of halide substituent on benzene ring ,which factor dominates
a. inductive effect
b. electron withdrawing effect
c. positive I effect
d. resonance effect
Correct Option: d
29. methyl group (+I) at aromatic ring in electrophilic substitution
a. disperse positive charge
b. intensify positive charge
c. don’t affect it
d. none of these
Correct Option: a
30. Molecular orbital in aromatic structure are
a. partially filled
b. half filled
c. unpaired electrons
d. completely filled
Correct Option: d
31. most common elimination mechanism is
a. E2 mechanism
b. E1 mechanism
c. E1cB
d. none of these
Correct Option: a
32. nitro group at aromatic ring in electrophilic substitution
a. Intensify positive charge
b. disperse positive charge
c. don’t affect it
d. none of these
Correct Option: a
33. Nucleophilic attack in case of ketone reagent will be at
a. carbonyl carbon
b. at hydrogen
c. at methyl group
d. none of these
Correct Option: a
34. polar solvent affect more rate of reaction of mechanism of
a. SN2
b. SN1+SN2
c. SNi
d. SN1
Correct Option: d
35. presence of halide substituent on benzene ring
a. activate the ring
b. deactivate the ring
c. don’t affect it
d. none of these
Correct Option: a
36. Protic solvent (with active H) in SN2 mechanism will
a. Decrease the rate of reaction
b. increase rate of reaction
c. has no affect
d. none of these
Correct Option: a
37. reaction in the presence of zinc, carbonyl compound and alpha halo ester is
a. cannizro reaction
b. reformatsky reaction
c. Ene reaction
d. perkin reaction
Correct Option: b
38. Secondary halide shows mechanism
a. SN1
b. SN2
c. Sni
d. SN1+SN2 intermediate
Correct Option: d
39. SN1 mechanism proceed by
a. Carbocation
b. carboanion
c. Two step process
d. none of these
Correct Option: a
40. SN2 mechanism proceed by
a. Carbo-anion
b. Carbocation
c. Inversion of configuration
d. Retention of configuration
Correct Option: c
41. Strong nucleophile will prefer and control rate of reaction of mechanism
a. SN1
b. SN1+SN2
c. SNi
d. SN2
Correct Option: d
42. substituents activate or deactivate the ring predominately at
a. ortho site
b. meta site
c. ortho and para site
d. para site
Correct Option: c
43. there should be no alpha hydrogen in aldehyde during
a. perkin reaction
b. mannich reaction
c. Cannizro reaction
d. aldol condensation
Correct Option: c
44. What factors control SN2 MECHANISM?
a. electronic and steric factor
b. electronic
c. steric
d. none of these
Correct Option: a
45. What proceed reaction toward completion
a. Optimum temperature
b. High concentration of reactant
c. Stability
d. All of above
Correct Option: d
46. which of following reaction aromatic rings usually don’t undergo
a. electrophilic addition rxn
b. nuceophlic substitution rxn
c. electrophilic substitution rxn
d. none of these
Correct Option: a
47. which one of following is more stable one
a. crbocation
b. phenyl cation
c. carbonion
d. none of these
Correct Option: a
48. which reaction mechanism undergo disproportination reaction
a. perkin reaction
b. mannich reaction
c. Cannizro reaction
d. aldol condensation
Correct Option: c
49. which two reaction follow same general mechanism with little difference
a. reformatsky reaction & aldol condensation
b. reformtsky and mnnich rection
c. reformatsky and perkin
d. none of these
Correct Option: a
