Compound A with molecular formula C6H10 has two peaks in its spectrum, both of which are singlets

Question:

Compound A with molecular formula C6H10 has two peaks in its spectrum, both of which are singlets (with ratio). Compound A reacts with an acidic aqueous solution containing mercuric sulfate to form compound B that gives a positive iodoform test (Section 19.4) and that has an 1H NMR spectrum that shows two singlets (with ratio 3 : 1). Identify A and B.