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Write the IUPAC name of the following :- (CH3)2C=CHCOCH3Marks:1
The IUPAC name of (CH3)2C=CHCOCH3 is 4-methylpent-3-en-2-one.
Mention two properties of acetonitrile because of which it acts as a good solvent.Marks:1
Acetonitrile is used as a solvent for performing many organic reactions because:– (1) It has high polarity, so, it is capable of dissolving a variety of solvents. (2) It is soluble in water.
What makes alkali metal halides sometimes coloured, which are otherwise colourless?Marks:1
Due to F centres or electron trapped in anionic vacancies, alkali metal halides are sometimes coloured otherwise they are colourless.
State Henry's law about the solubility of a gas in a liquid .Marks:1
According to Henry's law, the solubility of a gas in a liquid is directly proportional to the pressure of the gas.
p = KH X
Define the order of a reaction .Marks:1
The order of reaction is the sum of the concentration power terms in an experimentally determined rate of a reaction.
Write the cell reactions which occur in lead storage battery (i) When the battery is in use. (ii) When the battery is on charging.Marks:2
The cell reaction occurring in lead storage battery (i) When the battery is in use:– At anode - PbSO4(s) + 2e- → Pb(s) + SO42-(aq) At cathode – PbO2(s) + SO42-(aq) + 4H+(aq) + 2e- → PbSO4(s) + 2H2O(l)
(ii) When the battery is on charging –The reaction is reversed on charging. So, PbSO4(s) on anode and cathode is converted into Pb and PbO2 respectively.
Give chemical reaction in support of each of the following statements: (i) The +1 oxidation state gets stabilised progressively from Ga to Ti in Group 13
(ii) All the bonds in PCl5 are not equivalent.Marks:2
(i) This question is not in 2007-2008 syllabus. (ii) PCl5,when reacts with water,first POCl3 and then phosphoric acid are formed. PCl5 + H2O → POCl3 + 2HCl POCl3 + 3H2O → H3PO4 + 3HCl As two axial P-Cl bonds are repelled by three bond pairs ,but three equatorial bonds are repelled by 2 bond pairs. So, axial bonds are longer than equatorial bonds.
Explain the following terms:
(a) Asymmetric molecule
(b) R and S notationsMarks:2
(a) Asymmetric molecule - When all the four atoms or groups attached to the carbon atom are different, then the molecule is called an asymmetric molecule. e.g. C F Cl Br I (all the 4 halogens are attached to C atom) .The carbon atom is called chiral carbon atom. An asymmetric molecule is known as enantiomers with non- super imposable mirror images. (b) This question is not in 2007-2008 syllabus.
Write the names of the reagents and equations in the conversion of :-
(a) Phenol to salicylic aldehyde
(b) anisole to p-methoxyacetophenoneMarks:2
(a) Phenol to salicylic aldehyde:–
The above reaction is called Reimer-Tiemann reaction. (b) Anisole to p-methoxyacetophenone:-
Write the modes of free radical polymerization of an alkene.Marks:2
Polymerization of alkene takes place through radicals which are generated by an initiator. An initiator is a molecule that decompose to provide radicals easily. e.g. t-butyl peroxide is used as initiator because it decomposes under mild conditions to form t-butoxide radical.
This free radical adds to a monomer molecule to form a free radical of larger size. These repeated additions form polymers.