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Q118 (IAS/2001) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Organic chemistry basics Answer Verified

Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons ?

Result
Your answer: —  Â·  Correct: A
Explanation

Alkanes increase in molecular weight with each added CH2 unit. The four compounds are methane (CH4), ethane (C2H6), propane (C3H8) and butane (C4H10) as listed in the textbook table [1]. Their molar masses (g·mol–1) are approximately: CH4 = 16.05, C2H6 = 30.08, C3H8 = 44.11 and C4H10 = 58.14, showing a clear ascending sequence from methane to butane . Therefore the correct increasing order of molecular weights is methane < ethane < propane < butane, corresponding to option 1.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.2.2 Chains, Branches and Rings > p. 64
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