Propose a structure for a compound with the molecular formula C10H12O that fits the following spectroscopic data.
IR: 1680 cm⁻1
1H NMR (delta; ppm) :
1. 0 (triplet, 3H) ,
1. 5 (sextet, 2H) ,
2. 6 (triplet, 2H) ,
7. 5 (multiplet, 5H)
Molecule labeled as Roman numeral I is a compound with the SMILES string CCCC(=O) c1ccccc1.
Molecule labeled as Roman numeral II is a compound with the SMILES string CCC(=O) Cc1ccccc1.
Molecule labeled as Roman numeral III is a compound with the SMILES string CC(=O) CCc1ccccc1.
Molecule labeled as Roman numeral IV is a compound with the SMILES string O=CCCCc1ccccc1.
a) I
b) IV
c) II
d) III