(d) 15 mhz h nmr spectrum of (cto0 mhz at room temperature, the number of singlet resonances observed in the "h nmr spectnim me,cc(o)nme, (n, n-dimethyl pivalam

(d) 15 MHz H NMR spectrum of (CTO0 MHZ At room temperature, the number of singlet resonances observed in the "H NMR spectnim Me,CC(O)NMe, (N, N-dimethyl pivalamide) is (a) 3 (d) 2 Which of the following compounds is cxpected to show a sharn sinalet far ana (b) 4 (C)5 49.