Sketch the line structure of the compound 3,6-dibromooctane.

Line structure of 3,6-dibromooctane with bromine substituents at positions 3 and 6.

Line structure of 3-bromooctane with a bromine substituent at position 3.

Line structure of 3,5-dibromooctane with bromine substituents at positions 3 and 5.

Line structure of 2-bromooctane with a bromine substituent at position 2.