If you would like to know which measurement is not equivalent to the others, you can calculate this using the following steps:
1 quart = 4 cups = 2 pints = 32 fl. oz.
2 quarts = 2 * 4 cups = 8 cups
2 quarts = 2 * 2 pints = 4 pints
2 quarts = 2 * 32 fl. oz. = 64 fl. oz.
Not equivalent: 72 fl. oz.