Q51. Gasohol, which is used as fuel in motor vehicles, is a mixture of ____
- Aof methane and alcohol
- Bpetrol and alcohol
- Cof hydrogen and alcohol
- Dnatural gas and alcohol
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Answer: C) of hydrogen and alcohol
Organic Chemistry
243 MCQ questions with answers and explanations · page 3 of 10
Q52. Diesel is used in heavy vehicles because ____
- AHigher mileage and engine protection
- BLower costs and fuel savings
- CHigh efficiency and economic savings
- DBecause it is cheaper than petrol
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Answer: B) Lower costs and fuel savings
Q53. What is the quality of petrol expressed by?
- Acetane number
- BAdditive unleaded compounds
- Coctane number
- DSwarnaka
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Answer: C) octane number
Q54. The octane number of a good knock-proof compound is ____
- AHigh
- BLower
- CZero
- Dinfinite
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Answer: C) Zero
Q55. To increase the anti-explosive quality of petrol, _____ is used
- Atetramethyl lead
- Btetahit limit
- CTrimable lead
- Dtriethyl lead
Show answer & explanation
Answer: A) tetramethyl lead
Q56. The best antiknock compound used in petrol is ____
- Asodium ioxide
- Bzinc ethyl
- CEthyl Magnesium Bromide
- Dlead tetraethyl
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Answer: B) zinc ethyl
Q57. The petrol sold at petrol stations is blended gasoline. When mixed_
- AThe antiknock properties of petrol increase
- Bpetrol becomes cheaper
- CThe smell is reduced
- DThe smoke emitted on burning of petrol is reduced.
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Answer: D) The smoke emitted on burning of petrol is reduced.
Q58. How is the quality of a gasoline sample determined?
- AIts iodine value
- Bfrom its mass density
- Cby its octane number
- Dby its cetane number
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Answer: A) Its iodine value
Q59. Glycol is added to aviation gasoline because it ____
- AReduces evaporation of petrol
- BIncreases the efficiency of petrol.
- CPrevents freezing of petrol
- DReduces petrol consumption
Show answer & explanation
Answer: C) Prevents freezing of petrol
Q60. The wax obtained from petroleum is_
- ACarnauba wax
- BJojoba wax
- Cparaffin wax
- DBee wax
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Answer: C) paraffin wax
Q61. Where is spermatic wax obtained from?
- Afrom palm leaves
- Bfrom honeycombs
- Cfrom petroleum
- Dfrom whales
Show answer & explanation
Answer: C) from petroleum
Q62. From what is commercial Vaseline extracted?
- Aplant gum
- Bbitumen
- CArn wax
- Dpetroleum
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Answer: D) petroleum
Q63. Paraffin is a by-product of what?
- Apetroleum refining
- Bprocessing of agricultural waste
- CCottage industries engaged in beekeeping
- Dleather industry
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Answer: D) leather industry
Q64. What is the main component of petrol?
- APentane
- BOctane
- Cmethane
- DHexane
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Answer: A) Pentane
Q65. Petroleum is a homogeneous mixture of ______.
- Aof carbonates
- Bof carbohydrates
- Cof hydrocarbons
- Dnone of these
Show answer & explanation
Answer: B) of carbohydrates
Q66. The general formula of saturated hydrocarbons is_
- ACn H²n +¹
- BCn H²n +²
- CCn H²n -¹
- DCn H²n -²
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Answer: C) Cn H²n -¹
Q67. The general formula of alkyne is ____
- ACnH²n
- BCnH²n-²
- CCnH²n+²
- DCnH²n-¹
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Answer: B) CnH²n-²
Q68. The general formula of alkene is_
- ACnH²n
- BCnH²n-¹
- CCn H²n +¹
- DCnH²n+²
Show answer & explanation
Answer: B) CnH²n-¹
Q69. What is the chemical formula of propane?
- AC²H⁶
- BCH⁴
- CC⁴H¹⁰
- DC³H⁸
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Answer: A) C²H⁶
Q70. How many carbon and hydrogen atoms are there in propane respectively?
- A2,6
- B2,4
- C4,7
- D3,8
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Answer: D) 3,8
Q71. How many covalent bonds are there in the chloropropane molecule whose molecular formula is CH-CIT?
- A6
- B8
- C9
- D10
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Answer: D) 10
Q72. The parent of all aliphatic compounds is considered to be ____
- Amethane
- BEthane
- Cbenzene
- DEthylene
Show answer & explanation
Answer: A) methane
Q73. The shape of methane molecule is-
- AAngular
- Brhombic
- Clinear
- Dcoplanar
Show answer & explanation
Answer: B) rhombic
Q74. The bond angle between carbon and hydrogen in the methane molecule is ____
- A105°
- B120°
- C180°
- D109° 28'
Show answer & explanation
Answer: D) 109° 28'
Q75. The correct statement about 'methane' is_
- AIt originates from the bacterial decomposition of plant and animal matter buried in marshy areas.
- BIt is the first member of the saturated hydrocarbon series.
- CIt is also called marsh gas.
- DAll of the above
Show answer & explanation
Answer: D) All of the above