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UPSC 2001: Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons?
(a)Methane, ethane, propane and butane
(b)Propane, butane, ethane and methane
(c)Butane, ethane, propane and methane
(d)Butane, propane, ethane and methane
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Not attemptedCorrect Answer: (a) Methane, ethane, propane and butane
Molar masses of straight-chain alkanes rise with carbon number: CH₄ (16 g mol⁻¹) < C₂H₆ (30 g mol⁻¹) < C₃H₈ (44 g mol⁻¹) < C₄H₁₀ (58 g mol⁻¹). Hence the increasing-weight sequence is methane, ethane, propane, butane, i.e., option (a). ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-2001-solved-question-paper/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2001 Science & Technology question?▼
The correct answer is option (a): Methane, ethane, propane and butane. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Chemistry question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2001, GS Paper 1, as Question 118. It falls under Science & Technology > Chemistry.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Chemistry?▼
UPSC has asked 53 questions from Chemistry (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.