Compound A has molecular formula C₇H₁₄O and reacts with sodium borohydride in methanol to form an alcohol. The ¹H NMR spectrum of compound A exhibits only two signals: a doublet (I = 12) and a septet (I = 2). Treating compound A with 1,2-ethanedithiol (HSCH₂CH₂SH) followed by Raney nickel gives compound B.

(a) How many signals will appear in the ¹H NMR spectrum of compound B?

(b) How many signals will appear in the ¹³C NMR spectrum of compound B?

(c) Describe how you could use IR spectroscopy to verify the conversion of compound A to compound B.