needhelpwithchem

How can gas chromatography determine what mechanism a reaction underwent? For example, I was to synthesize an alkyl halide using 1-propanol, NaBr, and sulfuric acid. I know its a substitution reaction, but how can gas chromatography tell me whether its SN...

What alkyl halide or product will I get if I mix 2,4-dimethyl-3-pentanol with NaBr and sulfuric acid, and what substitution mechanism, SN1 or SN2 will that reaction undergo? Thanks in advance. What if I mix 1-propanol with NaBr and sulfuric acid, what mec...