Discussion
Match the absorption with the group responsible.
1. Broad band near 3400 cm\( ^{-1} \) 2. Strong sharp band near 1700 cm\( ^{-1} \) 3. Weak band near 2200 cm\( ^{-1} \)
P. Carbonyl Q. Hydrogen-bonded hydroxyl R. Carbon-carbon triple bond
Answer: D
Correct answer: 1-Q, 2-P, 3-R
Three of the most useful diagnostic bands. A broad absorption near 3400 is the hydrogen-bonded O-H stretch, broadened by the range of bonding environments. A strong sharp band near 1700 is the carbonyl, intense because the bond is highly polar. A weak band near 2200 is a carbon-carbon triple bond, weak because a nearly symmetrical alkyne undergoes little dipole change.
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