Final answer:
Whitman achieved his specific purposes with all poetic techniques except rhymed couplets.
Step-by-step explanation:
Whitman achieved his specific purposes with all of the following poetic techniques except Rhymed couplets. Whitman is known for his pioneering use of Free verse, which does not adhere to traditional rhyme or meter. He also employs Repetition and Cataloging as poetic techniques in his work.