5. When (R)-4-bromohept-2-yne is treated with excess H2 in the presence of Pd/C, the product is optically inactive. When (R)-4-bromohex-2-yne is treated in the same conditions, the product is optically active. Explain this observation.

Which of the following is an example of how telecommunication devices people do their jobs? a.) a security guard checks the time using a digital watch. b.) a banker does some quick math using a solar calculator. c.) a nurse uses a digital thermometer to take a patient’s temperature. d.) a construction worker reports in to his office using a cell phone.