The difference between theÂ molecular massess between two adjacent members is 14 u.
As the given compound contains 4 carbons and a -OH functional group which shows its name to be Ethanol.
You have to make sure that you judge the functionl group present in the given compound correctly.
The IUPAC name of vinegar is ethanoic acid .
In order to name this compound you should first count how many carbons are there and then look for the functional group attached to it to decide its name according to the IUPAC standards.
The IUPAC name for the given organic compound is pentane as deplcted by the figure 10_04_014_07
As soon as you see a -OH functional goup attached to an alkyl group you should recog nise it as an Alcohol . And the given alkyl group contains 4 carbons so it could be none other than butanol.
As the given compound contains ketone functional group so the suffix -one should be added after Butane removing (e) from it .
No sooner than you see the carboxylic functional group you should start anticipating the oic acid suffix to the given Alkyl group.So for the given compound it should be Butanoic acid.
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