Briefly explain the following procedures and safety precautions you should take

Question

Briefly explain the following procedures and safety precautions you should take in this experiment. (a) Why are AgCl plates protected from exposure to the light? (b) Why is it essential that you not handle KBr or NaCl plates with your bare hands? (c) What are the hazards of the unknowns? (d) What will you do if some of an unknown is spilled? Give the frequency ranges (in cm^-1) for each of the following: (a) O-H stretch (b) carbonyl stretch of an aldehyde (c) -C-H stretch (d) = C-H stretch How could you distinguish between cyclohexane and cyclohexene using IR?

Explanation / Answer

Q.1: (a): Why AgCl plates are protected from exposure to light

Q.2:(a): The frequency range for -OH stretch is 3250 - 3640 cm-1 ( both hydrogen bonded and free -OH group).

(b): carbonyl stretch of aldehyde - 1720 - 1740 cm-1

(c): -C - H stretch - 1350 - 1470 cm-1

(d): =C-H stretch - 650 - 1000 cm-1

Q.3: Cyclohexene will have a strong peak in the range of 650 - 1000 cm-1 which is absent in cyclohexane.

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