$2,6-$ Dimethylheptane on monochlorination produces…….. derivatives

2,6 - dimethyl heptane is a disubstituted alkane in which two methyl groups are attached to the second and sixth carbon atoms on the parent chain. The structure of the 2,6 - dimethyl heptane can be drawn as-
 

As the diagram suggests, there are four free terminal methyl groups. Monochlorination can occur on all of them. The products formed after mono chlorination will be -