Final answer:
To draw the structure of the 1 isomer of C7H16 with an ethyl branch on the parent chain, begin with a five-carbon straight chain, then attach a two-carbon ethyl group to the first carbon of the main chain. Fill in the appropriate number of hydrogens to ensure that each carbon has four bonds and that the total number of hydrogen atoms is 16.
Step-by-step explanation:
The student has asked to draw the structure of the 1 isomer of C7H16 that contains an ethyl branch on the parent chain. To make an ethyl branch, we look for a two-carbon side chain. Given that this is an isomer of heptane (C7H16), the main chain must have seven carbons.
To accomplish this, we begin by drawing a straight chain of five carbon atoms to represent the main chain of heptane. This will leave us with two more carbons, which we will use to create the ethyl branch. We then attach the ethyl group (a two-carbon chain) on the first carbon of the main chain. Now, you have a compound with a total of seven carbon atoms, satisfying the C7H16 formula, and with an ethyl group as one of its branches, specifically on the first carbon.
Remember to complete all of the carbon atoms' four bonds with hydrogen atoms, and ensure that there are a total of 16 hydrogen atoms in the structure. Drawing out the full structure, each carbon atom, except for the ones at the ends of the chain, will have two hydrogens, the ones at the ends will have three hydrogens, and the carbon atoms in the ethyl branch will have the appropriate number of hydrogen atoms to make four bonds.