Breadcrumb Home Chemistry CHEM& 252 CHEM& 252: Organic Chemistry II Lab [M/S] Program Chemistry Credits 2 Lab to be taken concurrently with CHEM& 242. $25 science fee. Distribution: Math & Natural Sciences Prerequisite Completion of CHEM& 241 and CHEM& 251, both with a 2.0 or better, and concurrent enrollment in CHEM& 242.