Without looking at the structures, use the names of the groups to find the number of carbon atoms; then use the (2n+2) rule to determine the molecular formula for each of the following compounds. 3-(1,1-dimethylethyl)hexane and 4-(1,2,2-trimethylpropyl)nonane.

Revise the given incorrect name by using IUPAC nomenclature. (Hint: Use the incorrect name given, draw the structure first, and then assign it a proper name.)

1,4-diethylcyclopentane

Four students were shown a structure and asked to give it a systematic name. They gave it four different names. Identify the correct name.

Give the systematic names for all alkanes that do not have any secondary hydrogen with the molecular formula given below.
C₆H₁₄

For each of these incorrect or incomplete names write the corresponding structure and name the structure appropriately. (i): 4-ethyl-5-methylhexane; (ii): 2-ethyl-3-methylhexane; (iii): 3-dimethylpentane

Select structures that correspond to the same compound. Also identify structures that correspond to different compounds.

Draw all the possible alkyne isomers with a molecular formula of C₇H₁₂, give the systemic name of each isomer, and highlight the acetylic hydrogen if the isomer is a terminal alkyne.