Question

7. One of Christina's other employees allowed water to get into another chemical bottle containing an alkyne - would this error affect the IR spectrum and ultimately the ID of the chemical? Explain. EEE fx e Normal . BIUXX- BEIT (4pts) 8. One of your experiments coming up involves the dehydration of cyclohexanol (an alcohol) to form cyclohexene. Would infrared spectroscopy help determine if your reaction was successful? Explain. Normal : BIUX, X- BITS De

Answer 1

1.Addition of water to Alkyne will adversely affect the IR of the compound as now, Alkyne has been hydrated to a ketone. So initially, if the IR spectrum of the compound in bottle (ie an Alkyne) gave a peak at 2200cm-1, it will now give a peak at 1715cm-1( ie a ketone).

2.Yes IR can help to differentiate between the two compounds due to the presence of different functional groups ( one is an alcohol and other is an alkene).

The peak of oh is at 3300cm-1 while that of an alkene is at 1680-1640cm-1 of c=c along with a peak at 3000-3100cm-1 of C-H.