Give the $\mathrm{IUPAC}$ name of the following alkane:

  Give the $\mathrm{IUPAC}$ name of the following alkane:

Give the $\mathrm{IUPAC}$ name of the following alkane:

Give the $\mathrm{IUPAC}$ name of the following alkane:
 

Give the $\mathrm{IUPAC}$ name of the following alkane:

Give the $\mathrm{IUPAC}$ name of following alkane:

What is wrong with the following name? Draw the structures they represent and give their correct name.

1,1-Dimethylpentane