Question

Draw the structural formula for 1 bromo 3 phenyl 5 heptyne

Answer 1

See Figure 4 below.

1. Draw a 7-carbon chain and number the carbon atoms (Figure 1).

2. Insert a triple bond between atoms 5 and 6 (Figure 2).

3. Attach a phenyl group to atom 3 (Figure 3).

4. Attach a Br to atom 1 (Figure 4).

And you have your structure.

Note: The C≡C triple bond takes priority in the naming, so we must number the chain from the other end. The correct name is

7-bromo-5-phenylhept-2-yne (all one word).