Permanent dipole-dipole attraction between molecules - (CH3)2CO

1. In one of chemistry specimen paper,
question asks to find which substance had the permanent dipole-dipole attraction out of following examples :
- CCl4
-C2F4
-(CH3)2CO
-CO2
the answer was the third molecule.
But doesn't the first one also have a dipole attraction?


2. Also, how do you distinguish dipole-dipole bond in a compound in general, do you have to count every bond's attraction?

Thanks a lot!