Chapter 1 - Introduction and Review - Study Problems - Page 36: 1-23 c

This compound is a mixture of ionic and covalent bonding. There is an ionic bonding between $CH_3$ and Li, and covalent bonding between Carbon and Hydrogens.

There is a covalent bonding between Carbon and hydrogen in $CH_3$ because carbon and hydrogen share electrons. There is an ionic bonding between $CH_3$ and Li because the Li gives an electron to the $CH_3$.