When dissolved in CDCl3 compound K, with the molecular formula C4H3O2 gives a 1HNMR spectrum that contains a doublet at 5 1.35, a singlet at 2.15, a broad singlet at 3.75(1H), and a quartet at 4.25(1H). When dissolved in D2O, the compound gives a similar 1H NMR spectrum, with the exception that the signal at 53.75 has disappeared. The IR spectrum of the compound shows a strong absorption peak near 1720cm1. Choose all of the explanatichs that apply for why the NMR signal at 3.75 disappear when D2O is used as the solvent. Broad peaks always disappear when compounds which display them are dissolved in D2O. OH and NH hydrogens rapidly exchange in D2O. The D2O causes the peaks to become so broad that they cannot be seen. Secondary hydrogens rapidly exchange in D2O. Primary hydrogens rapidly exchange in D2O. Tertiary hydrogens rapidly exchange in D2O