Which one of the following is the strongest base in aqueous solution?

In the chemical reaction,
CH₃CH₂NH₂ + CHCl₃ + 3KOH $$\to$$ (A) + (B) + 3H₂O, the compound (A) and (B) are respectively

The secondary structure of a protein refers to

Assuming that water vapour is an ideal gas, the internal energy change $$\left( {\Delta U} \right)$$ when $$1$$ mol of water is vapourised at $$1$$ bar pressure and $${100^ \circ }C$$ (Given : molar enthalpy of vapourisation of water at $$1$$ bar and $$373$$ $$K$$ $$ = 41\,kJ\,mo{l^{ - 1}}\,$$
and $$R = 8.3\,J\,mo{l^{ - 1}}\,{K^{ - 1}}$$ )