could someone help me with this problem I keep getting it wrong someone help ple

Question

could someone help me with this problem I keep getting it wrong someone help please!

11 16AM CHEM110G-MOI-T/Th-S0.20-11.35 am az 5 l 11 of 11 Chris w 10 Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. chemical symbol, chemical formula or Lewis structure boiling point (Choose one) CH3-N CH3 (Choose one CH, CaBr (Choose one) H :0 H N-CH3 Choose one) CH Submit Asignment Worked Example

Explanation / Answer

In general ionic compounds have higher melting and boiling points than covalent compounds.

Thus Cabr2 is the one with highest boiling point.

Among the organic compounds we need to see the molar mass, intermolecular attractive forces .

Thus compound D is an amide(quite polar) with much greater molar mass. thus next higher boiling point goes for D .

Then A which is an alcohol has extensive H- bonding, thus has next higher boiling point.

Lastly the amine B with relatively lower molar mass and less polarN-H and less stronger H-bonding is the least boling of all.

Thus the order of decreasing boiling point is

C > D > A > B

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