Question
Define electronegativity. How it is different from electron gain enthalpy? Explain the periodic trend of electronegativity in periodic table.
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Answer
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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?
Write Lewis structure of the following compounds and show formal charge on each atom.
HNO3, NO2, H2SO4.
HNO3, NO2, H2SO4.
The effect of uncertainty principle is significant only for motion of microscopic particles and is negligible for the macroscopic particles. Justify the statement with the help of a suitable example.
Explain the mechanism of sulphonation and Friedel Crafts reaction.
A photon of wavelength 4 × 10 – 7m strikes on metal surface, the work function of the metal being 2.13eV. Calculate
- The energy of the photon (eV),
- The kinetic energy of the emission,
- The velocity of the photoelectron (1 eV = 1.6020 × 10 – 19J).
The value of $K _{ p }$ for the reaction,
$
CO_2(g)+C(s) \rightleftharpoons 2 CO(g)
$
is 3.0 at 1000 K . If initially, $P_{ CO _2}=0.48$ bar and $P _{ CO }=0$ bar and pure graphite is present, calculate the equilibrium partial pressures of CO and $CO _2$.
→$
CO_2(g)+C(s) \rightleftharpoons 2 CO(g)
$
is 3.0 at 1000 K . If initially, $P_{ CO _2}=0.48$ bar and $P _{ CO }=0$ bar and pure graphite is present, calculate the equilibrium partial pressures of CO and $CO _2$.
The ionization constant of propanoic acid is 1.32 × 10–5. Calculate the degree of ionization of the acid in its 0.05M solution and also its pH. What will be its degree of ionization if the solution is 0.01M in HCl also?
Attempt any five of the following:
1. Can a catalyst change the position of equilibrium in a reaction?
2. To which category of compounds does cyclohexane belong?
3.
4. What is hydrogenation?
5. What are conformations?
6. The intermediate carbocation formed in the reactions of $HI , HBr$ and HCl with propene is the same and the bond energy of $HCl , HBr$ and HI is $430.5 kJ mol ^{-1}, 363.7 kJ mol ^{-1}$ and $296.8 kJ mol ^{-1}$ respectively. What will be the order of reactivity of these halogen acids?
7. State Le chatelier's principle.
→1. Can a catalyst change the position of equilibrium in a reaction?
2. To which category of compounds does cyclohexane belong?
3.
4. What is hydrogenation?
5. What are conformations?
6. The intermediate carbocation formed in the reactions of $HI , HBr$ and HCl with propene is the same and the bond energy of $HCl , HBr$ and HI is $430.5 kJ mol ^{-1}, 363.7 kJ mol ^{-1}$ and $296.8 kJ mol ^{-1}$ respectively. What will be the order of reactivity of these halogen acids?
7. State Le chatelier's principle.
1. Give condensed and bond line structural formulas and identify the functional groups present, if any, for:
a. 2, 2, 4-Trimethylpentane
b. 2-Hydroxy-1, 2, 3-propanetricarboxylic acid
c. Hexanedial?
2. Give three points of differences between inductive effect and resonance effect.
a. 2, 2, 4-Trimethylpentane
b. 2-Hydroxy-1, 2, 3-propanetricarboxylic acid
c. Hexanedial?
2. Give three points of differences between inductive effect and resonance effect.
Following results are observed when sodium metal is irradiated with different wavelengths. Calculate (a) threshold wavelength and (b) Planck's constant.
→| $\lambda( nm )$ | 500 | 450 | 400 |
| $v \times 10^{-8}\left(cm s ^{-1}\right)$ | 2.55 | 4.35 | 5.35 |