Choose the word whose underlined part is pronounced differently from the others

choose the word whose underlined part is pronounced differently from the others 
2. A. catch                   B. chat                      C. school                           D. mechanic
3. A. designs               B. sails                      C. pedals                           D. pollutes
choose the word whose main stress is placced differently from the others
4. A. traffic                   B. artisitc                   C. Chemical                      D. logical
5. A. engineer             B. Chinese                 C. guarantee                     D. volunteer