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Organic Chemistry Questions and Answers – Structure of Pyridine | Organic Chemistry Multiple Choice Questions and Answers

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(1) Pyridine is a which type of heterocyclic compound from the following options?
[A] Six membered heterocyclic compound
[B] Seven membered heterocyclic compound
[C] Four membered heterocyclic compound
[D] Five membered heterocyclic compound
Answer: Six membered heterocyclic compound
(2) Which element is present as hetero atom in pyridine?
[A] Sulphur
[B] Nitrogen
[C] Oxygen
[D] Sulphur and nitrogen
Answer: Nitrogen
(3) The electron of Nitrogen participating in the resonance in pyridine is present in which orbital?
[A] p-orbital
[B] sp2-orbital
[C] sp3-orbital
[D] sp -orbital
Answer: sp2-orbital
(4) Pyridine is a not a planner compound?
[A] True
[B] False
Answer: False
(5) How many number of resonating structure stabilises a pyridine molecule?
[A] 4
[B] 5
[C] 6
[D] 7
Answer: 5
(6) Pyridine come under which category of heterocycle classification on the basis of chemical behavior?
[A] -excessive heterocycle
[B] -deficient heterocycle
[C] -equivalent heterocycle
[D] can’t say about the five membered rings
Answer: -deficient heterocycle
(7) What is the smallest angle in pyridine ring?
[A] 116.7°
[B] 115.0°
[C] 124.0°
[D] 118.1°
Answer: 116.7°
(8) What is the dipole moment of the pyridine?
[A] Zero
[B] 2.2 D
[C] 1.17 D
[D] 4.3 D
Answer: 2.2 D
(9) Which of the following is the correct range for the bond length in the pyridine molecule?
[A] 1.34 – 1.40 A°
[B] 1.24 – 1.32 A°
[C] 2.4 – 2.49 A°
[D] 1.02 – 1.17 A°
Answer: 1.34 – 1.40 A°
(10) What is the greatest angle in pyridine ring?
[A] 116°
[B] 140°
[C] 124°
[D] 118°
Answer: 124°
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