Identify the structure of compounds

A,B

and

C

based on the following reaction and

^()H

NMR spectrum of compound

C

.\ Compound-A

->t-BuOK

Compound-B\

BH_(3)

, THF\

H_(2)O_(2),NaOH

\ Compound-C\

C_(4)H_(9)Br

\ 3\ Compound-C\ 2\ 1\ 2\ 2\ 4\ midide\ 0\ 5\ 4\ 3\ 2\ 1

Identify the structure of compounds A,B and C based on the following reaction and 1H NMR spectrum of compound C. 1) BH3,THF Compound-A t-BuOK Compound-B 2) H2O2,NaOH Compound-C