Which of the following compounds contains a functional group with two oxygen atoms?

• A. ${\mathrm{CH}}_3{\mathrm{CH}}_3{\mathrm{CH}}_3\mathrm{NH}{2}_{}$ (tert-butylamine)
• B. ${\mathrm{CH}}_3{\mathrm{CH}}_3{\mathrm{CH}}_3\mathrm{COOH}$ (acetic acid)
• C. ${\mathrm{CH}}_3{\mathrm{CH}}_3{\mathrm{CH}}_3\mathrm{OH}$ (tert-butanol)
• D. ${\mathrm{CH}}_3{\mathrm{CH}}_3{\mathrm{CH}}_3\mathrm{Cl}$ (tert-butyl chloride)

Answer: (B)

Verified step by step guidance

1. Identify the functional groups present in each compound by analyzing their molecular formulas and common names.
2. Recall that a functional group containing two oxygen atoms typically includes groups like carboxylic acids (–COOH), esters (–COOR), anhydrides, or peroxides.
3. Examine tert-butylamine (\( \mathrm{(CH_3)_3CNH_2} \)) which contains an amine group (–NH2) with no oxygen atoms.
4. Look at acetic acid (\( \mathrm{CH_3COOH} \)), which contains a carboxylic acid group characterized by one carbonyl (C=O) and one hydroxyl (–OH) oxygen, totaling two oxygen atoms in the functional group.
5. Check tert-butanol (\( \mathrm{(CH_3)_3COH} \)) and tert-butyl chloride (\( \mathrm{(CH_3)_3CCl} \)) which contain only one oxygen (in the alcohol) or none (in the chloride), so they do not have functional groups with two oxygen atoms.