BP Question

Started by DWade101
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DWade101

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Ok. Will the DAT ask you to compare the boiling points of different functional groups? If so, assuming the same amount of carbons, say 4, what about the order of boiling points be of an alcohol, anhydride, carboxylic acid, butane, ester, ether?
 
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DWade101 said:
Ok. Will the DAT ask you to compare the boiling points of different functional groups? If so, assuming the same amount of carbons, say 4, what about the order of boiling points be of an alcohol, anhydride, carboxylic acid, butane, ester, ether?
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I recommend a google search... I am sure you can find some boiling points that can be used as benchmark.
 
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DWade101 said:
Ok. Will the DAT ask you to compare the boiling points of different functional groups? If so, assuming the same amount of carbons, say 4, what about the order of boiling points be of an alcohol, anhydride, carboxylic acid, butane, ester, ether?
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Well think of the H bonding, carboxylic acids has the highest BP since it forms a dimer, then comes anhydride,alcohol, ether on the other hand is very volitile.
 
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DWade101 said:
Ok. Will the DAT ask you to compare the boiling points of different functional groups? If so, assuming the same amount of carbons, say 4, what about the order of boiling points be of an alcohol, anhydride, carboxylic acid, butane, ester, ether?
Click to expand...


I have forgot all of this stuff. I think the boiling point increases with the amount the functional group can hydrogen bond ie alcohol would have the highest bioling point followed by carboxylic acids. Dont quote me on any of this.
 
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tiny2533 said:
I have forgot all of this stuff. I think the boiling point increases with the amount the functional group can hydrogen bond ie alcohol would have the highest bioling point followed by carboxylic acids. Dont quote me on any of this.
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No, carboxylic acid has a higher BP since it forms dimers.
 
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heshyn2000 said:
No, carboxylic acid has a higher BP since it forms dimers.
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Exactly, look at carboxylic acid...it can form two hydrogen bonds ( 1 off the hydroxyl and 1 off the carbonyl) whereas alcohols can only form 1 H bond. That also means that carboxylic acids can H-bond with themselves. Ethers can't H-bond at all, because the oxygen is attached to alkyl groups, not F, O, or N.
 
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