A sample of explosives residue is dissolved in an appropriate solvent and is injected into HPLC. The column contains a non- polar stationary phase. The sample revealed three chemical compounds that are commonly present in homemade explosives. TATP DADP HMTD 1 2 3 4 5 Retention time (minutes) a) determine the retention time of TATP. b) which one elute first :DADP,TATP or HMTD? c) State and explain which compound is most polar. d) If you are investigating this terrorist attacks, state one way in which the information in the chromatogram would be useful.

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