I want to do a DNA extraction, so I need isoamyl alcohol. I have isoamyl alcohol, but open for 5 years, is it still good?

I need to buy chloroform. I know there is already mixed chloroform/isoamyl alcool 24:1, but I prefer to buy the chloroform only and eventually use it in other experiments. Do you know if this chloroform is suitable for nucleic acid extraction (there are a lot of choice):

http://www.sigmaaldrich.com/catalog/product/sial/496189?lang=en®ion=CA

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