Question
Analyse the modern classification of organic compounds.

Answer

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  2. What is the effect of temperature on solubility of gases in liquids?
  3. Equilibrium constant for the reaction is 4.0. What will be the equilibrium constant for the reverse reaction.
  4. Calculate the pH of 10-8M HCl solution.
Attempt any five of the following:
1. What effect does branching of an alkene chain has on its boiling point?
2. What are Arenes?
3. Write IUPAC name of the following: $CH _3\left( CH _2\right)_4 CH \left( CH _2\right)_3 CH _3 CH _2- CH \left( CH _3\right)_2$
4. Why are alkanes called paraffins?
5. State Le chatelier's principle.
6. What is decarboxylation? Give an example.
7. Arrange the following: $HCl , HBr , Hl , HF$ in order of decreasing reactivity towards alkenes.
It has been found that the pH of a 0.01M solution of an organic acid is 4.15. Calculate the concentration of the anion, the ionization constant of the acid and its pKa.
Explain isomerism and nomenclature of alkynes.
Calculate the degree of ionization of 0.05M acetic acid if its pKa value is 4.74. How is the degree of dissociation affected when its solution also contains (a) 0.01M (b) 0.1M in HCl?
$\Delta\text{G}$ is net energy available to do useful work and is thus a measure of “free energy”. Show mathematically that $\Delta\text{G}$ is a measure of free energy. Find the unit of $\Delta\text{G}$ . If a reaction has positive enthalpy change and positive entropy change, under what condition will the reaction be spontaneous?
  1. Heat(q) and work done (W) individually are not state functions but their sum is always a state function. Explain why?
  2. Calculate the standard enthalpy change $(\Delta_\text{r}\text{H}^\theta)$ and standard internal energy change $(\Delta_\text{r}\text{U}^\theta)$ for the following reaction at 300K:

OF2(g) + H2O(g) + O2(g) + 2HF(g)

Standard enthalpy of formation $(\Delta_\text{r}\text{H}^\theta)$ of e n various species are given below:

$\Delta_\text{f}\text{H}^\theta\text{kJ mol}^{-1}:$ OF2(g) = 23.0, H2O(g)= -241.8, HF(g) = -268.6, R = 8.314 JK-1mol-1.

What is electron gain enthalpy? State the periodic trend of it in groups and periods.
Define the first law of thermodynamics and also derive its mathematical form.
For the reaction,

2A(g) + B(g) → 2D(g)

$\Delta\text{U}^\ominus=-10.5\text{kJ} \ \text{and} \ \Delta\text{S}^\ominus=-44.1\text{kJ}^{-1}.$

Calculate $\Delta\text{G}^\ominus$ for the reaction, and predict whether the reaction may occur spontaneously.