For a given reaction, which statement is true? a. The equilibrium constant is always the
same number, but the concentration of
reactants and products can vary at
equilibrium.
b. The equilibrium constant is always the
same number as long as the
temperature is held constant.
c. The equilibrium constant is always the
same number as long as the pressure is
held constant
d. The equilibrium constant is always the
same number as long as the
concentration of CO2​ is held constant

           The correct answer is Option-D (6 Hydrogen atoms).

Explanation:

                  Carbon atom has a unique property of linking to it self and making a chain of carbon called as Catenation. In a molecule having two carbon atoms there must be a bond between the two carbon atoms. The bond can be saturated (single bond) or unsaturated (double or triple bond). But as the statement states maximum number of hydrogen atoms so, we will asume the bond between two carbon atoms to be single.

                  As carbon has four valence electrons so, it has the ability to make four single bonds. In given molecule each carbon has already made a single bond with another carbon therefore, each carbon is left with three more unpaired electrons which will make covalent bond with three hydrogen atoms each as shown in attached structure.