According to the text, what are the three main categories of hydrocarbons based on the types of carbon-carbon bonds present?

As described in the text, which of the following statements is correct regarding the general formula for alkanes?

According to the text, what is the bond angle in methane?

As mentioned in the text, what are alkanes formerly known as and why?

Based on the information provided, which metals are used as finely divided catalysts in the hydrogenation of alkenes and alkynes to form alkanes?