5 monochloro derivative will be yield to when 2 methylbutane react with chlorine. 4 carbon atom are present in 2 methylbutane which react with chlorine. The chiral carbon that is carbon anti bonding react with chlorine to form four different groups around it hence it will stereoisomer
Yes your answer is correct the answer is 1.26
solution is moles=mass/molar mass =98.3/78=1.26
D. It slows down
It slows down because the water keeps its from sinking