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For the following bond cleavages, use curved-arrows to show the electron flow and classify as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.
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For the following bond cleavages, use curved-arrows to show the electron flow and classify as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.
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Which of the following carbocation is most stable?
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The equilibrium constant for the following reaction is 1.6 ×105 at 1024K
\[\ce{H2(g) + Br2(g) ⇌ 2HBr(g)}\]
Find the equilibrium pressure of all gases if 10.0 bar of HBr is introduced into a sealed container at 1024K.
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Describe the structure of the common form of ice.
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Among the elements \[\ce{B, Al, C}\] and \[\ce{Si}\], which element has the most metallic character?
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Arrange the elements \[\ce{N, P, O}\] and \[\ce{S}\] in the order of increasing non metallic character. Give reason for the arrangement assigned.
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Among alkali metals which element do you expect to be least electronegative and why?
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What is meant by the term average bond enthalpy? Why is there difference in bond enthalpy of \[\ce{O - H}\] bond in ethanol \[\ce{(C2H5OH)}\] and water?
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The variation of pressure with volume of the gas at different temperatures can be graphically represented as shown in figure.
On the basis of this graph answer the following questions.
(i) How will the volume of a gas change if its pressure is increased at constant temperature?
(ii) At a constant pressure, how will the volume of a gas change if the temperature is increased from 200 K to 400 K?
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Match the following gas laws with the equation representing them.
| (i) Boyle's law | (a) `V oo n` at constant T and p |
| (ii) Charle's law | (b) PTotal = p1 + p2 + p3 + at constant T, V |
| (iii) Dalton's law | (c) `(pV)/T` = Constant T |
| (iv) Avogadro law | (d) `V oo T` at constant n and p |
| (e) `P oo 1/V` at constant n and T |
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We know that the relationship between Kc and Kp is Kp = Kc (RT)∆n What would be the value of ∆n for the reaction \[\ce{NH4Cl (s) ⇌ NH3 (g) + HCl (g)}\]
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Why do beryllium and magnesium not impart colour to the flame in the flame test?
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What is the correct order of decreasing stability of the following cations.
| I. | \[\ce{CH3 - \overset{⊕}{C}H - CH3}\] |
| II. | \[\ce{CH3 - \overset{⊕}{C}H - OCH3}\] |
| III. | \[\ce{CH3 - \overset{⊕}{C}H - CH2 - OCH3}\] |
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Covalent bond can undergo fission in two different ways. The correct representation involving a heterolytic fission of CH3 – Br is:
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Write structures of various carbocations that can be obtained from 2-methylbutane. Arrange these carbocations in order of increasing stability.
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Match the intermediates given in Column I with their probable structure in Column II.
| Column I | Column II |
| (i) Free radical | (a) Trigonal planar |
| (ii) Carbocation | (b) Pyramidal |
| (iii) Carbanion | (c) Linear |
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Which of the following practices will not come under green chemistry?
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An alkene ‘A’ contains three C – C, eight C – H σ bonds and one C – C π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write IUPAC name of ‘A’.
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An alkene ‘A’ contains three C–C, eight C–H σ bonds and one C–C π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write IUPAC name of ‘A’.
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