Consider the Data Below to Answer the Following Question(s)

Essay

Consider the data below to answer the following question(s).
C₇H₁₄O
IR:
1715 cm−¹
MS:
M⁺ at m/z = 114, α-cleavage fragment at m/z = 71.
McLafferty rearrangement fragment at m/z = 86.
¹H NMR:
0.92 δ (6 H, triplet), 1.59 δ (4 H, multiplet), 2.36 δ (4 H, triplet)
-Refer to instructions. What functional group is indicated by the IR data?