How could spectroscopy be used to support that the below reaction occurred? Use

Question

How could spectroscopy be used to support that the below reaction occurred?

Use UV-vis; the product would show an absorbance at a longer lambda_max from that of the starting material. Use UV-vis; the product would show an absorbance at a shorter lambda_max from that of the starting material. UV-vis will not be useful as no change in would occur. Use IR; the starting material has a strong broad peak at 3000-3300 cm^-1, but the product does not. Use IR; the product has a strong broad peak at 3000-3300 cm^-1, but the starting material does not. Use IR; the starting material has a strong peak at 1700 cm^-1, but the product does not. Use IR; the product has a strong peak at 1700 cm^-1, but the starting material does not. IR will not be useful as no detectable change in the spectrum will occur.

Explanation / Answer

first option is correct

because in product conjugation is gettingextanding

opton 7 is correct

because in product C=o streching will be there around at 1700 cm-1

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