Molecules that exhibit hydrogen bonding:
\[\text{CH}_3\text{OH}, \, \text{H}_2\text{O}, \, \text{HF}, \, \text{NH}_3, \, \text{C}_6\text{H}_5\text{NO}_2\]
Benzene (C$_6$H$_6$) does not form hydrogen bonds. Total number of molecules exhibiting hydrogen bonding:
\[5\]
If \[ \frac{dy}{dx} + 2y \sec^2 x = 2 \sec^2 x + 3 \tan x \cdot \sec^2 x \] and
and \( f(0) = \frac{5}{4} \), then the value of \[ 12 \left( y \left( \frac{\pi}{4} \right) - \frac{1}{e^2} \right) \] equals to: