In 3,3dimethylbut1ene, all of t he th ree H s for the following bonded across the double bo provide the following doublet of doublet s ignals . Match the 3 H s with the 3 nd given signal s in HNMR at 2 30 MHz.

-20 -10 0 10 20 Hz 5.85 (dd, J = 17.5, 10.7 Hz, 1H) M_ . -20 -10 0 10 4.91 (dd, J = 17.5, 1.4 Hz, 1H) MM -10 0 10 20 Hz 4.83 (dd, J = 10.7, 1.4 Hz, 1H)