Question

Need answers ASAP pls it’s final exam! Also pls answer with the letter of the right choice only not details! Thank u!

image attached What is the best reagent to complete this synthesis? 1) ???? OH 2) NaCN B. Responses: A. PBr3 ClSiMe3 SOCI2 D. MsC!

Answer 1

1. Option D, since it inovles single Sn2 reaction with inversion of configuration

2. Option D, example for SN1 mechanism

3. Option D, since it is 3° allylic carbocation stabilized by positive mesomeric effect.