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If you were to take a TLC of your Grignard solution before you add it to...

If you were to take a TLC of your Grignard solution before you add it to the dry ice, what would your TLC look like?   

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Answer #1

Dry Ice is solid CO2.

If a TLC of the grignard solution was taken before the dry ice was added, it would not have CO2 yet, which means the solution is still phenylmagnesium (C6H5Mg) and is not benzoic acid (C6H5COOH) yet. This will cause a spot to be formed on the C6H5Br lane and a spot aligned with a C6H5Br spot on the other two lanes, which indicates the presence of C6H5Br in the solution.

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