Deficiency of which vitamin causes loss of appetite,mental confusion,fatigue,and muscle depreciation?

Identify the physical and chemical processes from the following:
$I - Ba(OH)_2 + H_2SO_4 \rightarrow BaSO_4 + 2H_2O$
$II -$ Ice $\rightarrow$ Water
$III -$ Water $\rightarrow$ Steam
$IV -$ Starch $\rightarrow$ Glucose
Which of these represent physical processes and chemical processes respectively?

Which one of the following is an antioxidant vitamin?

What is the distance '$a$' in the given figure (in $pm$)?

Match the following columns:

Column $I$	Column $II$
$(A)$ Chlorine	$(i)$ Outer surface of aerial parts of plants
$(B)$ $DHAP$	$(ii)$ Structural component of plant cell wall
$(C)$ Cellulose	$(iii)$ Osmoregulation in blood
$(D)$ Crotonic acid	$(iv)$ Phosphorylated ketotriose
$(E)$ Wax	$(v)$ Unsaturated fatty acid

Vitamin $A$ was discovered by