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

I. Choose the word whose underlined part is pronounced differently from that of the others:
1. A. chair B. chemist C. chalk D. chin
2. A. quick B. queue C. quiet D. quit
II. Choose the word that has the main stress different from that of the others:
3. A. appreciate B. embrace C. increase D. formally
4. A. stimulate B. control C. helicopter D. constancy