A. Define conversion factor.

A conversion factor is an expression for the relationship between units that are used to change the units of a measured quantity without changing the value. A conversion ratio (or unit factor) always equals one, where the numerator and the denominator have the same value expressed in different units.

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.