The answer would be: 7
A covalent bond is a bond that made of two atoms that share one or more electrons. In the molecule of ch3-ch2cl, there are two carbon atoms in the middle. The first carbon is having 3 covalent bonds with the hydrogen forming CH3. Then the first carbon forms a covalent bond with the second carbon.
The second carbon will form 3 covalent bonds, 2 with H2 and 1 with Cl. The total bond would be 3+1+3= 7
