Which one of the following compounds (1 to 4) corresponds to the IR spectrum shown? (you can refer to a table of characteristic absorptions) Spectra reproduced with permission from NIST

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The question asks which of compounds 1–4 corresponds to the provided IR spectrum, with options a. 1, b. 2, c. 3, d. 4.

Before judging, note that the image of the IR spectrum is the key piece of data needed to match a specific compound class or functional group pattern to one of the four candidates. To do this properly, you would typically:
- Identify key absorption bands (approximate wavenumbers) and their shapes from the spectrum (e.g., broad O–H around 3200–3600 cm−1, sharp C≡O around 1680–1750 cm−1, sharp C≡N around ~2220 cm−1, C=O around ~1700 cm−1, C–H stretches near 2850–3000 cm−1, fingerprint region below 1500 cm−1 with characteristic peaks).
- Compare those key features to the known functional groups present in each candidate compound (1–4). Look for matches or mismatches, not just overall similarity.
- Consider if the spectrum shows overlap or unusual patterns that might require more careful interpretation (e.g., conjugation shifting C=O, or multiple functional groups giving overlapping bands).

Because the actual chemical structures for compounds 1–4 are not provided in the prompt, and the image quality of the IR plot in this context is not fully resolved, I cannot reliably assign the spectrum to a specific option (a, b, c, or d) without additional information. If you can share:
- The structural formula or functional groups for compounds 1–4, and
- A higher-resolution view (or a list of the major absorptions and their approximate wavenumbers) from the IR spectrum,
I can give a precise, option-by-option analysis addressing why each choice is correct or incorrect.

In a typical analysis, you would proceed as follows for each option once the spectrum’s key peaks are clear:
- For the option that features a carbonyl group (C=O): check if a strong band around 1650–1750 cm−1 is present; if it is absent, that option is unlikely unless the carbonyl is in resonance-depressed form or masked.
- For alcohol or phenolic OH (broad ~3200–3600 cm−1): see if a broad band is present; if not, exclude options containing free OH groups unless intramolecular hydrogen bonding or esterified forms explain missing intensity.
- For amines (N–H around 3300–3500 cm−1) or nitriles (~2250 cm−1): verify corresponding bands.
- For alkynes (C≡C–H ~3300 cm−1, C≡C ~2100–2260 cm−1) and aromatics (multiple bands in 1600–2000 cm−1 and fingerprint region): evaluate presence/absence.

If you provide the necessary details, I can deliver a thorough, option-by-option reasoning for a, b, c, and d with specific references to the spectrum features and the chemistry of each compound.

Which one of the following compounds (1 to 4) corresponds to the IR spectrum shown? (you can refer to a table of characteristic absorptions) Spectra reproduced with permission from NIST

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