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AS chemistry help -When do you use hydroxy- to name an OH functional group

youreanutter

as in the book it says hydroxy for prefix for OH and suffix is ol but i've never seen hydroxy used

Reply 1

NadeemKha_Arab

Original post by youreanutter

as in the book it says hydroxy for prefix for OH and suffix is ol but i've never seen hydroxy used

As an A2 I can only ever remember using -ol in exam papers. Depends on your exam board, but if you are asked to name an alcohol it will contain the suffix -ol, rather than the prefix hydroxy-.

Reply 2

username2463673

Original post by youreanutter

as in the book it says hydroxy for prefix for OH and suffix is ol but i've never seen hydroxy used

It's the prefix equivalent so use it when the suffix is used, e.g. if there's a carboxyl functional group.

Reply 3

hassan1236945

I know im a bit late but wouldnt this be 23456 pentahydroxy hexanal instead of hexanoic acid as the functional group on the first carbon is CHO and not COOH

Reply 4

username1445490

There is an order of precedence for functional groups.

Order of precedence

If you have more than one functional group then the highest one forms the suffix and the others are prefixes.

Eg.