25. M/J 2016/P11/Q38
Which statement about alkanes is correct?
A Ethane reacts with chlorine in an addition reaction.
B Propane has a higher boiling point than butane.
C The molecule of the alkane that contains 99 carbon atoms has 200 hydrogen atoms.
D There are three isomers with the formula C4H10
Answer: C
Explaination
Alkane are saturated HC with single C-C and C-H bond. These bonds are strong and are difficult to break. As a result alkanes are generally unreactive. However, alkanes react with halogens in the presence of sunlight. This process is called substitution reaction. Alkane has general formula CnH2n+2 so if number of carbon atoms are 99 so the molecular formula will be C99H200. Their physical properties like melting point, boiling point, viscosity increases down the series as they become longer HC chain with increase molecular size and the attractive forces become stronger.
