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Need urgent help on general molecular formulae for organic compounds

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I'm currently working on an organic chemistry assignment where we are told to explore all 12 functional groups of organic compounds. I'm stuck as to how to give the general molecular formula for these 12 (alkane, alkene, alkyne, alcohol, ether etc), so could anybody help me out? Any help is appreciated. This is what I have so far and I'm sure there are some mistakes. n = subscript for the number of atoms.

Alkane - C(n)H(2n+2)

Alkene - C(n)H(2n)

Alkyne - C(n)H(2n-2)

Alcohol - C(n)H(2n-2)OH

Ether - C(n)H(2n+2)O

Aldehyde - C(n)H(2n+1)COH

Ketone - C(n)H(2n)O <---- should the O be somewhere in the middle of the formula since it is a ketone?

Carboxylic acid - C(n)H(2n-1)COOH

Ester - C(n)H(2n+2)COO

Amine (primary) - C(n)H(2n+1)NH2

Amide - C(n)H(2n+2)CONH

Alkyl Halide - C(n)H(2n+1)X, X = any halogen (F, Cl, Br, I)

Thanks!

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Ketone C(3+n)O(n)H(6+2n)

By the way, I'm sure this is really find to, just google general formulas for organic homologous series :)

Edited by omri

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Alkynes are not in the curriculum. They weren't for 2011 at least...

Neither were ethers I think O.o

You have all of them as far as I can tell since you don't do cyclic molecules either.

An ester isn't always going to end with OO. The general idea is RCOOCR, you can have more stuff on either side of the ester group.

That's all I found to say stuff about XD

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