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

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Q: 118 (IAS/2001)
Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons ?
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,90,25,90,7,7,11

keywords: 

{'molecular weights': [0, 0, 1, 0], 'hydrocarbons': [1, 0, 2, 5], 'methane': [0, 0, 0, 5], 'butane': [0, 0, 5, 5], 'order': [6, 12, 34, 35], 'propane': [1, 0, 4, 4]}