Chemistry · Chapter 8 of 11

Organic Chemistry: BPSC & UPPCS Prelims PYQs

16 previous-year questions on Organic Chemistry. Each one opens to its answer and explanation.

1. 1. 70th BPSC Prelims 2024

   Which of the following is not an electrophile?

   1. ANa+
   2. BBF3
   3. CH+
   4. DAll of the above
   Answer and explanation →

2. 2. 68th BPSC Prelims 2023

   Which acid is described as HOOCCOOH?

   1. ACarbonic acid
   2. BOxalic acid
   3. CAcetic acid
   4. DMore than one of the above
   5. ENone of the above
   Answer and explanation →

3. 3. 68th BPSC Prelims 2023

   The odour of acetic acid resembles that of

   1. Avinegar
   2. Btomato
   3. Ckerosene
   4. DMore than one of the above
   5. ENone of the above
   Answer and explanation →

4. 4. 67th BPSC Prelims 2022 Asked again

   Which among the following is the main constituent of biogas?

   1. APropane
   2. BButane
   3. CEthane
   4. DMethane
   5. ENone of the above/More than one of the above
   Answer and explanation →

5. 5. 67th BPSC Prelims 2022 Asked again

   Which of the following is the major constituent of the liquefied petroleum gas?

   1. AMethane
   2. BEthane
   3. CPropane
   4. DButane
   5. ENone of the above/More than one of the above
   Answer and explanation →

6. 6. UPPSC Prelims 2022 Asked again

   Which among the following compounds is the main constituent of natural gas?

   1. AButane
   2. BHexane
   3. CBenzene
   4. DMethane
   Answer and explanation →

7. 7. UPPSC Prelims 2022 Asked again

   Compressed Natural Gas (CNG) is mainly composed of

   1. AMethane
   2. BPropane
   3. CEthane
   4. DButane
   Answer and explanation →

8. 8. UPPSC Prelims 2021 Asked again

   Which one of the following is the main constituent of LPG?

   1. AHexane
   2. BPentane
   3. CButane
   4. DMethane
   Answer and explanation →

9. 9. 66th BPSC Prelims 2020

   The incomplete burning of petrol and diesel produces

   1. Anitric oxide
   2. Bnitrogen dioxide
   3. Ccarbon dioxide
   4. Dcarbon monoxide
   5. ENone of the above / More than one of the above
   Answer and explanation →

10. 10. 66th BPSC Prelims 2020

    The numbers of sigma and pi bonds in benzene are

    1. A3, 3
    2. B3, 6
    3. C12, 3
    4. D12, 6
    5. ENone of the above / More than one of the above
    Answer and explanation →

11. 11. UPPSC Prelims 2020

    Which of the following polymer is NOT a thermoplastic?

    1. ATeflon
    2. BNeoprene
    3. CPolystyrene
    4. DPolythene
    Answer and explanation →

12. 12. UPPSC Prelims 2020

    Which one of the following substances is NOT synthetic?

    1. AFibroin
    2. BLexan
    3. CNeoprene
    4. DTeflon
    Answer and explanation →

13. 13. 65th BPSC Prelims 2019

    Natural rubber is a polymer of

    1. Aisoprene
    2. Bstyrene
    3. Cvinyl acetate
    4. Dpropene
    5. ENone of the above / More than one of the above
    Answer and explanation →

14. 14. UPPSC Prelims 2017 Asked again

    The stench due to leakage from LPG cylinder because of:

    1. AMethane
    2. BPropane
    3. CButane
    4. DEthyl mercaptan
    Answer and explanation →

15. 15. UPPSC Prelims 2016 Asked again

    Which one of the following gases, released from bio-gas plant is used as a fuel gas?

    1. AButane
    2. BPropane
    3. CMethane
    4. DEthane
    Answer and explanation →

16. 16. 56th–59th BPSC Prelims 2014

    Which of the following elements is found in all organic compounds?

    1. ACarbon
    2. BCalcium
    3. CNitrogen
    4. DOxygen
    Answer and explanation →