Which of the following conversion units is not correct?

$\mathrm{J}{\mathrm{kg}}^{-1}{\mathrm{m}}^{-1}\equiv {\mathrm{ms}}^{-1}$ of the following conversion units is not correct

Unit conversion refers to multiplying or dividing a quantity by conversion factors to convert it from one unit to another unit of measurement. Using scientific notation, the units are stated and then transformed to numerical values in accordance with the quantities.