Organic Chemistry Questions and Answers – Combustion of Organic Compounds | Organic Chemistry Multiple Choice Questions and Answers

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Questions
1 What is the concentration of carbon dioxide in the atmosphere?
A 3.5 x 106 ppm
B 1.0 x 102 ppm
C 1.6 x 105 ppm
D 1.0 x 103 ppm

Answer: 3.5 x 106 ppm
2 Which of the following reaction has a faster rate of reaction for nascent oxygen atom?

Organic Chemistry

A R1 >> R2
B R1 > R2
C R1 << R2
D R1 < R2

Answer: R1 << R2
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3 Which of the following is not true about combustion of hydrocarbons?
A All hydrocarbons react in air to form carbon monoxide and then carbon dioxide
B First step is always the reaction between the hydrocarbon and hydroxyl radical
C Alkanes, the hydroxyl radical abstracts a hydrogen atom and forms a carbanion
D With alkenes and alkynes, the electron-deficient hydroxyl radical adds to the multiple bond

Answer: Alkanes, the hydroxyl radical abstracts a hydrogen atom and forms a carbanion
4 What is the type of reaction between alkanes and hydroxyl radical?
A endothermic
B exothermic
C isothermal
D isochoric

Answer: exothermic
5 Which of the following statement is incorrect about oxidation number?
A Show electron density and about the tendency of an atom or molecule to engage oxidation-reduction reactions
B The oxidation number is always given in Roman numerals while the formal charge is always given in numbers
C To calculate an oxidation number, it is essential to know which element in a chemical bond is the most electronegative
D It cannot be a negative number

Answer: It cannot be a negative number
6 With respect to enthalpy of combustion which of the following is correct?
A ∆Hrxn = Σ∆Hf (product) – Σ∆Hf (reactant)
B ∆Hrxn = Σ∆Hf (reactant) – Σ∆Hf (product)
C ∆Hrxn = Σ∆Hf (product) + Σ∆Hf (reactant)
D ∆Hrxn = 2 Σ∆Hf (product) – Σ∆Hf (reactant)

Answer: ∆Hrxn = Σ∆Hf (product) – Σ∆Hf (reactant)
7 Equal volumes of C2H2 & H2 are combusted under identical condition. What will be the ratio of heat evolved for C2H2 and H2?

H2 (g) + 1/2 O2(g) → H2O(g), ∆H=-241.8 KJ

C2H2 (g) + 5/2 O2(g) → CO2(g) + H2O(g), ∆H=-1300 KJ

A 5.37/1
B 1/5.37
C 1/1
D 2.8/6.1

Answer: 1/5.37
8 The heat of combustion of carbon is 394 KJ/mol. What will be the heat evolved in combustion of 6.023 x 1022 atoms of carbon?
A 64.7 KJ
B 39.4 KJ
C 42.4 KJ
D 91.6 KJ

Answer: 39.4 KJ
9 The value ∆H transition of C (graphite) → C (diamond) is 1.9 kJ/mol at 25℃ entropy of graphite is higher than entropy of diamond. This implies that?
A C(diamond) is more thermodynamically stable then C (graphite) at 25℃
B C(graphite) is more thermodynamically stable than C (diamond) at 25℃
C diamond will provide more heat on complete combustion at 25℃
D ∆Gtransition of C (diamond) → C (graphite) is -ve

Answer: ∆Gtransition of C (diamond) → C (graphite) is -ve
10 Which of the following is the slow, low-temperature, flameless form of combustion, sustained by the heat evolved when oxygen directly attacks the surface of a condensed-phase fuel?
A Rapid combustion
B Turbulent combustion
C Spontaneous combustion
D Smouldering

Answer: Smouldering

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