Interpretation of the given set of spectra

1H NMR:
- There is one signal at 3.8 ppm, which is a multiplet (dddd).
- There are four other signals in the spectrum.

13C NMR:
- There are five signals at the following chemical shifts:
- 200 ppm (singlet)
- 55 ppm (doublet)
- 30 ppm (triplet)
- 26 ppm (triplet)
- 24 ppm (triplet)
- 20 ppm (triplet)

FTIR:
- There are two peaks observed in the FTIR spectrum at 2900 cm-1 and 1715 cm-1.

Interpretation:
From the given set of spectra, we can deduce the structure of the compound by analyzing the information provided in each spectrum.

1H NMR:
The singlet at 3.8 ppm (dddd) indicates the presence of four equivalent protons. This suggests the presence of a CH2 group in the molecule.

13C NMR:
The signals observed in the 13C NMR spectrum indicate the presence of different types of carbon atoms in the molecule. The chemical shifts and multiplicities provide information about the neighboring atoms and the connectivity of the carbon atoms.

- The singlet at 200 ppm suggests the presence of a carbonyl group (C=O) in the molecule.
- The doublet at 55 ppm indicates the presence of a carbon atom adjacent to a proton (CH).
- The triplet at 30 ppm suggests the presence of a carbon atom adjacent to two protons (CH2).
- The triplet at 26 ppm suggests the presence of a carbon atom adjacent to two protons (CH2).
- The triplet at 24 ppm suggests the presence of a carbon atom adjacent to two protons (CH2).
- The triplet at 20 ppm suggests the presence of a carbon atom adjacent to two protons (CH2).

FTIR:
The peaks observed in the FTIR spectrum provide information about the functional groups present in the molecule.

- The peak at 2900 cm-1 suggests the presence of C-H bonds, indicating the presence of alkyl groups in the molecule.
- The peak at 1715 cm-1 suggests the presence of a carbonyl group (C=O), which is consistent with the signal observed at 200 ppm in the 13C NMR spectrum.

Overall Interpretation:
Based on the analysis of the spectra, the compound is likely to have the following structure:
- A chain of CH2 groups, as indicated by the singlet at 3.8 ppm in the 1H NMR spectrum.
- A carbonyl group (C=O), as indicated by the singlet at 200 ppm in the 13C NMR spectrum and the peak at 1715 cm-1 in the FTIR spectrum.

Note:
To provide a more accurate interpretation and confirm the structure, additional information such as mass spectrometry data and other spectroscopic techniques may be required.