One of the following functional groups sometimes shows a single weak to medium I

Question

One of the following functional groups sometimes shows a single weak to medium IR absorption peak in the 2100 to 2250 cm^-t range. Depending on the structure of the compound this peak is sometimes not present making it easy to misinterpret the spectrum. Which functional group is it? 1) carbonyl 2) alkyne 3) alcohol 4) alkene Which compound has a single, weak IR absorption at 3300 cm^-1? 1) (CH_3CH_2)_2NH 2) CH_3CH_2CH_2OH 3) CH_3CH_2CN 4) CH_3CH = CHCH_3 Which compound lacks a strong characteristic IR absorption near 1700 cm^-1?

Explanation / Answer

Q1.

IR at 2100 to 2250

this is typically for an ALKYNE, i.e. C (triple bond) C

choose 2

Q2.

for a 3300 --> broad

will be typically for alcohols, R-OH

choose 2

Q3.

strong peak at 1700 -->

typically for a carbonyl group

C=O

choose 3

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