Question & Answer: C H 1.88 ppm: 2H d 1.80 ppm: 1H nonet 1.79 ppm: 3H singlet 6H 1H 1H J. 1.5Hz J= 1.5 Hz…..

IR

3100 cm-1 for =C-H stretch

2850-2950 cm-1 for -C-H stretch

1640 cm-1 for C=C stretch

1H NMR

0.9 ppm (d, 6H) for 2CH3’s next to CH

1.79 ppm (s, 3H) for CH3 on olefinic carbon

1.80 ppm (nonet, 1H) for CH between two CH3’s and a CH2

1.88 ppm (d, 2H) for CH2 next to CH

4.9 and 5.1 ppm (two doublets 1 H each) for alkenic protons

Possible structure