Step 1: Analysis of ¹H NMR signals with intensity ratio 1:2:3:
(A) (CH₃)₃B:N(CH₃)₃:
(B) (CH₃CH₂)₃B:N(CH₂CH₃)₃:
(C) H₃B:N(CH₂CH₃)₃:
(D) (CH₃CH₂)₃B:NH₃:
Answer: (C) and (D) are correct.

One mole of a monoatomic ideal gas starting from state A, goes through B and C to state D, as shown in the figure. Total change in entropy (in J K\(^{-1}\)) during this process is ............... 
The number of chiral carbon centers in the following molecule is ............... 
A tube fitted with a semipermeable membrane is dipped into 0.001 M NaCl solution at 300 K as shown in the figure. Assume density of the solvent and solution are the same. At equilibrium, the height of the liquid column \( h \) (in cm) is ......... 