Give a line drawing and molecular formula for the following: (a) A linear alkane with four carbon atoms, (b) An alkene with six carbon atoms in a ring and one double bond, (c) A linear alkyne with six carbon atoms and two triple bonds.

Alkanes are saturated hydrocarbons consisting only of carbon (C) and hydrogen (H) atoms, connected by single bonds. They follow the general formula CnH2n+2, where 'n' is the number of carbon atoms. For example, a linear alkane with four carbon atoms is butane (C4H10), which can be represented in a line drawing showing the carbon backbone with hydrogen atoms attached.

Alkenes are unsaturated hydrocarbons that contain at least one carbon-carbon double bond. They follow the general formula CnH2n, indicating that they have fewer hydrogen atoms than alkanes due to the presence of double bonds. A cyclic alkene with six carbon atoms and one double bond can be represented as cyclohexene (C6H10), where the double bond is depicted in the ring structure.

Alkynes are unsaturated hydrocarbons characterized by one or more carbon-carbon triple bonds. They follow the general formula CnH2n-2, which reflects the reduction in hydrogen atoms due to the triple bonds. A linear alkyne with six carbon atoms and two triple bonds can be represented as 1,5-hexadiyne (C6H6), where the structure shows the carbon chain with the appropriate placement of triple bonds.