Answer to Question #340906 in Organic Chemistry for Sachin

Question

Use the following NMR- and mass-spectral data to identify the structures of two unknown compounds, A and B. 

B: ¹H NMR: δ = 1.00 (s, 9 H), 1.17 (s, 6 H), 1.28 (s, 2 H), and 1.42 (s, 2 H) ppm. Mass spectrum m/z (relative intensity) = 129(0.05), 114(3), 72(4), and 58(100).