How many carbon atoms will be in the longest chain of 3,3,4,4-tetramethylhexane?
how many sub-chains will there be in 3,3,4,4-tetramethylhexane?

6and 4 i just did it 

The molecular formula of 3,3,4,4-tetramethylhexane is c10h22, where c10 signifies the number of carbon atom which is 10. the side chains are located and designated with a number, so in this molecular formula it has 4 side chains or groups represented by 3,3,4,4.