Question
Explain the structure of triple bond with diagram.
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Answer
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Distinguish between a sigma and a pi bond.
Which out of NH3 and NF3 has higher dipole moment and why?
Match the species in Column I with the type of hybrid orbitals in Column II.
→| Column I | | Column II | |
| i. | NO | a. | 1.5 |
| ii. | CO | b. | 2.0 |
| iii. | $\text{O}^{-}_{2}$ | c. | 2.5 |
| iv. | O2 | d. | 3.0 |
The ionization constant of phenol is 1.0 × 10–10. What is the concentration of phenolate ion in 0.05M solution of phenol? What will be its degree of ionization if the solution is also 0.01M in sodium phenolate?
In terms of period and group where would you locate the element with Z =114?
Attempt any five of the following:
(a) What happens when benzene is treated with acetyl chloride in presence of $AlCl _3$ ?
(c) Classify the hydrocarbons according to the carbon-carbon bond.
(d) Arrange the following: $HCl , HBr , Hl , HF$ in order of decreasing reactivity towards alkenes.
(e) Why is $CH _2= CH - CH _2- Cl$ more easily hydrolysed than $CH _3- CH _2- CH _2- Cl$ ?
(f) Which of the two trans-but-2-ene or trans-pent-2-ene is non-polar?
(g) What are benzenoids?
→(a) What happens when benzene is treated with acetyl chloride in presence of $AlCl _3$ ?
(c) Classify the hydrocarbons according to the carbon-carbon bond.
(d) Arrange the following: $HCl , HBr , Hl , HF$ in order of decreasing reactivity towards alkenes.
(e) Why is $CH _2= CH - CH _2- Cl$ more easily hydrolysed than $CH _3- CH _2- CH _2- Cl$ ?
(f) Which of the two trans-but-2-ene or trans-pent-2-ene is non-polar?
(g) What are benzenoids?
- Define standard enthalpy of formation. Explain why the enthalpy changes for the reaction given below are not enthalpies of formation of CaCO3 and HBr:
- $\text{CaO(s)}+\text{CO}_2(\text{g})\overrightarrow{\ \ \ \ \ \ \ \ }\ \text{CaCO}_3(\text{s});$ $\Delta_\text{r}\text{H}^\circ=-178.3\text{kJ mol}^{-1}$
- $\text{H}_2(\text{g})+\text{Br}_2(\text{g})\overrightarrow{\ \ \ \ \ \ \ }\ 2\text{HBr(g)};$ $\Delta_\text{r}\text{H}^\circ=-72.8\text{kJ mol}^{-1}$
- Use the bond enthalpies listed below to determine the enthalpy of reaction:
$\ \ \ \ \ \ \ \ \text{H}\\ \ \ \ \ \ \ \ \ \ |\\\text{H}-\text{C}-\text{H(g)}+2\text{O}=\text{O(g)}\overrightarrow{\ \ \ \ \ }\ \text{O}=\text{C}=\text{O(g)}\\ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \text{H}\\+2\text{H}-\text{O}-\text{H(g)}$
Bond enthalpy $(\Delta\text{H}^\circ)/\text{kJ mol}^{-1}$ of C=O = 741; C-H = 414; H-O = 464; O=O = 498.
The pH of 0.005M codeine (C18H21NO3) solution is 9.95. Calculate its ionization constant and pKb.
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.
→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.
Nitric oxide reacts with Br2 and gives nitrosyl bromide as per reaction given below:
$2\text{NO (g) + Br}_2\text{ (g)}\leftrightharpoons2\text{NOBr (g)}$
When 0.087mol of NO and 0.0437mol of Br2 are mixed in a closed container at constant temperature, 0.0518mol of NOBr is obtained at equilibrium. Calculate equilibrium amount of NO and Br2.
→$2\text{NO (g) + Br}_2\text{ (g)}\leftrightharpoons2\text{NOBr (g)}$
When 0.087mol of NO and 0.0437mol of Br2 are mixed in a closed container at constant temperature, 0.0518mol of NOBr is obtained at equilibrium. Calculate equilibrium amount of NO and Br2.