



To determine which reactions yield Ph-CH2-CH2-CO2Me as the major product, let's analyze each given option. The target molecule is a methyl ester formed from a phenethyl ketone. We expect some transformations that might include reactions like esterification, reduction or substitution.
In conclusion, based on the information, Options 2, 3, and 4 will yield the major product Ph-CH2-CH2-CO2Me when appropriate conditions are applied.
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 ......... 
An electron at rest is accelerated through 10 kV potential. The de Broglie wavelength (in A) of the electron is .............