Question

9) The IR spectrum for Compound 9 is shown below. INFRARED SPECTRUM 1 0.8 0.6 a 0.4 3000 2000 1000 Wavenumber (cm-1) Which one of the following compounds is most likely to be Compound 9? a) 1-cyano-3-methylbenzene b) 1-cyano-4-methylbenzene c) (1-methylphenyl)ethyne d) (4-methylphenyl)ethyne e) m-methylbenzaldehyde f) p-methylbenzaldehyde 2

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Answer #1

Answer:

a) 1-cyano-3-methylbenzene

Explanation:

The peaks at around 2100 cm^-1 indicates either cyano or ethyne group present. But there is no peak at 3300 cm^-1 in the spectrum indicates ethyne group is not present.So we confirmed only cyano group is present.

From the IR spectrum, we will find functional group easily not positions.Therefore, the answer may be 1-cyano-3-methyl benzene.

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