Why is option c the correct answer and not option a? H-C-C-C-C C-C-C-CC-H Nonane

Question

Why is option c the correct answer and not option a?

H-C-C-C-C C-C-C-CC-H Nonane 2.34 rifluoropentane Consider the molecules represented above and the data in the table below. Compound Molecular formula Molar mass (&/mol) 128 126 Boiling point (C) 151 89 Nonane C9H20 2,3,4-trifluoropentane CsHF ,3,4-trifluoropentane have almost identical molar masses, but nonane has a significantly higher boiling point. Which of the following statements best helps explain this observation? b. C. d. The C F bond is easier to break than the C-H bond The C-Fbond is more polar than the C-H boncd. The carbon chains are longer in nonane than they are in 2,3,4-trifluoropentane. The carbon chains are farther apart in a sample of nonane than they are in 2,3,4- trifluoropentane.

Explanation / Answer

The bond dissociation energy of C-F bond is 450 kJ/mol

The bond dissociation energy of C-H bond is 410 kJ/mol

The bond dissociation energy of C-F bond is more than the C-H bond. So C-F bond is not easier break than C-H bond.

So option (a) is not correct.

With increasing carbon chain length surface area is increasing and Van del Waals force strength is increases. Hence boiling point is increases.

Therefore option (C) correct.

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