Hydrocarbons

Question 1

Organic compound facts

Answer 1

Always contain Carbon and Hydrogen
May also contain other nonmetals like O, S, N, P, or a halogen

Question 2

Alkananes

Answer 2

End in -“ane”
Single bonds
Formula is CnH2n+2
Starts with Methan CH4

Question 3

Alkynes

Answer 3

End in -ane
Triple bondsP
Starts with
Ethyne C2H2

Question 4

Alkane examples

Answer 4

Methan CH4
Ethane C2H6
Propane C3H8

Question 5

Cycloalkanes

Answer 5

Have 2 fewer hydrogens
Example: Cyclopropane is C3H6

Question 6

Melting points

Answer 6

Alkanes have the lowest melting and boiling point of organic compounds
Exhibit only weak dispersion forces
Cycloalkanes have higher boiling points than straight chained ones

Question 7

What is true about branched alkanes?

Answer 7

Have lower boiling points than straight chained ones

Question 8

What is true about combustion of alkanes?

Answer 8

Burn readily in oxygen

Question 9

Cis isomers

Answer 9

Alkyl groups are attached on the same side of the double bond and H are on the other side

Question 10

Trans isomers

Answer 10

Groups and H atoms are on opposite sides of double bond

Question 11

Benzene

Answer 11

C6H6
Has 3 alternating double bonds