Which of the following molecules would probably be isolated closest to the top of a fractionating tower at a refinery?

Question

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The molecules that have a lower boiling point will be isolated closer to the top of a fractionating tower. The molecule in A has the lowest molecular weight (14) and the shortest carbon chain, which makes it less complex and easier to vaporize, so it is expected to have a lower boiling point than the other options.

Which of the Following Molecules Would Probably Be Isolated Closest