Passage VII
A carboxylic acid (CA) is a compound that contains a —COOH group. When a CA dissolves in H2O, it can dissociate, as shown below.
An atom's electronegativity (EN) indicates the atom's ability to attract electrons within a molecule (see Table 1). The presence of an electronegative atom in a CA, and the atom's proximity to the —COOH group, can affect the acidity of a CA.
Table 2 gives the pH of aqueous 1.00 M (mole per liter) CA solutions at 25°C. The CA in each solution is either an acetic acid or a propanoic acid (see Figure 1), where X and Y each represent an atom listed in Table 1.
37. Based on Figure 1 and Table 2, the structure shown below has which of the following formulas?
Your Answer is
Correct Answer is A
Explanation
Corresponding to table 2, it should be 3-bromopropanoic. It can be seen that there are two H atoms connected to the first C atom, and there are also two H atoms on the second C atom, so there will be no CH3 situation