How does a polar covalent bond differ from a nonpolar covalent bond?

a. in a polar bond, electrons are shared unequally.
b. in a polar bond electrons are transferred
c. a polar bond is always stronger
d. a polar bond only occurs with atoms of the same element.

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> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

the answer is barium and copper bromide