(a) A piece of iron rod is subjected to acidic environment in absence of oxygen. Write the cathodic and anodic reactions

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(a) A piece of iron rod is subjected to acidic environment in absence of oxygen. Write the cathodicand anodic reactions.(b) Explain tacticity in polymers using polystyrene. Give its effect on crystallinity of thepolystyrene polymer.(c) How does the molecular weight of polymer and branching of polymer chain affect the glasstransition temperature?(d)Give the type of the transition and corresponding wavelength for the following spectral region:i) Microwave ii) Infrared