Hello, could I get help on these?

What is the expected major product from the following reaction sequence? 'N KOH PCC Br ? OH 'N the corba (A) (B) (C) (D) Which of the following compounds is consistent with the 1H NMR spectrum shown? , 1H, S 1H, d TMS 2H, m TTTTTTTTTTT 8 7 6 5 4 3 2 1 0 ppm NC NC NC NC (A) (B) (C) (D) Which of the following tosylates would react fastest in an Sn1 reaction when heated in the presence of ethanol? OTs OTS OTS | OTS (A) (B) (C) (D)