Please help with the attached photo, please explain each. thank you ​

a) 3,4 dimethyl hexane.

b) 3 methyl hexane

c) 2, 4 dimethyl heptane

d) 2,4 di methtl hexane

Explanation:

Identify the longest chain.Number the carbons of the longest chain such that the sum of numbers at branch (methyl group here) is minimum.( You may need to do that more than once here)Name the group after mentioning the number of carbon it is at. Use di if two same groups are present. Tri for 3, tetra for 4 and so on.Naming thr longest chain is the last thing. If the hydrocarbon is pure (only H and C are present) use -ane as the ending and the number of carbon 1- meth , 2 - eth , 3 - prop, 4 -beut, 5- pent 6- hex and hept for 7 are used as prefix.

The se-ci  bonds is more polar  than s-br bond