For the following reaction, which of the following change(s) in the IR spectrum

Question

For the following reaction, which of the following change(s) in the IR spectrum is consistent with conversion of the reactant to the product? absorption at 3300 cm^-1 and 2150 cm^-1 should disappear, a new absorption at 1720 cm^-1 should appear absorption at 1650 cm^-1 should disappear, a new absorption at 3300 cm^-1 should appear absorption at 2250 cm^-1 should disappear, a new absorption at 3300 cm^-1 should appear absorptions at 3300 cm^-1 and 2150 cm^-1 should disappear only absorption at 2150 cm^-1 should disappear only Which of the m/z values corresponds to the base peak in the following mass spectrum?

Explanation / Answer

The reactant is a terminal alkyne and product is a ketone.

(1) Main IR peak for terminal alkynes is 2100-2260 cm-1 . It will disappear on coversion to ketone.

Peak for acetylenic C-H stretch at 3300cm-1 will also disappear.

(2) Main IR peak for ketone is 1750 - 1680 (s) (C=O Stretch) will appear due to formation of ketone.

Therefore the correct option is first.

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