hydrocarbons : alkanes & alkenes

Question 1

Which of the two are more reactive and why?

Answer 1

Alkenes as the double bond allows them to take part in reactions

Question 2

what is a homologous series?

Answer 2

Organic compounds with the same functional group, but a different number of carbon atoms, are said to belong to the same homologous series

Question 3

first 4 alkanes

Answer 3

methane, ethane , propane, butane

Question 4

first 4 alkenes

Answer 4

ethene, propene, butene, pentene

Question 5

as chain length increases, viscosity…

Answer 5

increases

Question 6

as chain length increases, flammability…

Answer 6

decreases

Question 7

as chain length increases, boiling point…

Answer 7

increases

Question 8

combustion reaction

Answer 8

hydrocarbon + oxygen = carbon dioxide + water

Question 9

which undergoes complete combustion

Answer 9

alkanes

Question 10

which undergoes incomplete combusition and why

Answer 10

alkenes as there is not excess oxygen

Question 11

incomplete combustion

Answer 11

hydrocarbon + oxygen = carbon monoxide + water

Question 12

what is produced in incomplete combustion

Answer 12

a smoky yellow carbon monoxide flame