PLEASE EXPLAIN WHY THESE ANSWERS:

6: B

7: D

19:C

H3C OTS Ts PQ-7. What is the major product? CH3 1. PBr3 2. NaCN CH3 CH3 OH CH3 CH3 (A) (A (B) (C) (D) CN CN ON CN PQ-19. What will react fastest with NaN3? (A) Br (B) Br (C) Br (D) Br 6. What is the rate determining step of this reaction? CH2CH3 NaCN Hul OTS acetone H3C (S)-isomer CH2CH3 (B) HU H3C Ts CN Hu H3C CH2CH3 (R)-isomer CH2CH3 (A) He H3C OTS Co-H CH2CH3 (C) NC CH2CH3 HU H3C OTS (D) NC : H3C