Difference between `*(arr+i) and (arr+i)`

An inductor (L) and resistance (R) are connected in series with an AC source. The phase difference between voltage (V) and current (i) is 45^(@) . Now a capacitor (C) is connected in series with L-R, If the phase difference between V and i remain same, then capacitive reactance and impedance of L-C-R circuit will be-

In the shown AC circuit phase different between current I_(1) and I_(2) is

Find the phase difference between i_(1) and i_(2) in the two branches of the circuit shown.

What is the difference between (i) hydrogenation and (ii) hydrogenolysis? Give one example of each.

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