Answer : The incorrect option is, 10 kg = 1 g
Explanation :
The following conversion used are,
Conversion of centimeter cube to milliliters :

Conversion of millimeter to meter :

or,

Conversion of centigram to gram :

or,

Conversion of kilogram to gram :

or,

As per question, only conversion (10 kg = 1 g) is incorrect conversion. While all the conversion are correct.
Hence, the incorrect option is, 10 kg = 1 g