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Chemistry 2 :Important and repeated Questions of past 15 year papers
Here are the questions of chp 1...... I will upload other chapters soon... All the best chemist.... please discuss your queries here so I could get advantage.....this is especially for you asma mehvish.
Give example in each case and explain the phenomenon of sp3, sp2 and sp hybridization.(2001) Explain the significance of pi bond. (2002) (a) In what respect sigma and pi bond are different from each other. (b)What are H-bonds and how they affect the properties of organic compounds. (c)Write an essay on hybridization and its significance in predicting the shapes of molecules (2007) (a) what is mesmerism? Give the conditions necessary for mesmerism. (b)what is intermolecular and intermolecular hydrogen bonding? Illustrate with example. (c)Indicate the type of hybridization in the following: Formaldehyde ,hydrogen cyanide ,dimethyl ether ,acetylene. (2010) Differentiate between intermolecular and intramolecular hydrogen bonding. Discuss effects of hydrogen bonding and any two properties of organic compounds. Support your answer with suitable example. (2011) (a) Explain why dipole moment if BF3 is zero ? (b) Why dipole moment of NH3 is greater than NF3? (c) Why does So2 have dipole moment while CO2 doesn't ? (2012) (a) Why do we use three p- orbitals(2px,2py,2pz) alone to form three equivalent hybrid orbitals of carbon? (b)Give an example of element that undergoes sp hybridization in forming covalent bond with other elements.what is the value of angle between the bond that results from s-sp overlap of atomic orbitals. (2013) Give one example with structure of each of the following: s-sp hybridization , sp2-sp2 hybridization , sp- sp2 hybridization. (2014) |
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Chapter : 2
How acetalide is prepared from aniline. (2003) How knocking problem of fuel engine can be solved ( 2003) Discuss importance of alkylation, hydroalkylation, and cracking in manufacture of petroleum (2005) Reaction of sodium ethoxide with bromomethane is about 10,000 times faster as compared to that with neo pentyl bromide. Explain with justification (2007) What is difference between clemensen and wolf kishner reduction (2010) Write a note on octane no. And catalytic cracking (2011) Define: Catalytic cracking, catalytic reforming, alkylation (2014) (a) wha are wetting agent and for what purpose the are used. (b) describe briefly the alternatives used in hydrogenation of vegetable oils for the formation of vegetable ghee. (c) give a laboratory test to differentiate between saturated and unsaturated molecules. (2014) Wite short note on antiknocking agent (2015)
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Me ne apne iraado ke tootney se Allah ko pehchana h... (Hazrat Ali) |
The Following User Says Thank You to shonNa For This Useful Post: | ||
Towards Success (Wednesday, October 07, 2015) |
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Jazak Allah kher. ...
Please describe about other chapters also Sent from my GT-I9505 using Tapatalk |
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I will soon post remaining section
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Me ne apne iraado ke tootney se Allah ko pehchana h... (Hazrat Ali) |
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Share important Questions of remaining chapters
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Chp : 3
(a) Why benzene undergoes electrophilic substitution raction whereas alkene undergo addition reaction. (b) How will you synthesized following compounds from benzene: Malic anhydride , acetophenone, chlorobenzene, glyoxal, benzne hexachloride (2001) (a) What do you know about nucleophilic aromatic substitution reactions. Give their synthetic applications. (b) Comment on limitation of friedal craft reaction . (2002) Draw molecular orbitals of following: 1,3-pentadiene benzene Allylic cation (2003) How sulphonation of benzene is carried out ? give mechanism . (2003) (a) What are hybrid orbitals? Discuss conditions of their formation. (b)Suggest reasons for the following statements: …… cyclooctatetraene does not show resonance while benzene show. …… o- benzoic acid is more acidic than its para-isomer. (2004) Describe the synthesis of 1,3,5 tribromo benzene from aniline? Eplain why it can not be synthesized by direct bromination of benzene. (2004) Explain why halogens are ortho, para directors and are deactivating. (2005) One mole of benzene is mixed with 1 mole of nitrobenzene and 1\2 mole of bromine .some FeBr3 is added and mixture is heated to reflux. what is the major reaction product .explain your answer giving full reaction. (2005) (a) What do you understand by aromaticity? (b) Which of the following compounds are aromatic and anti-aromatic and what’s reason for that: ……. Cyclobutadiene, cycloheptatrieny anion, azulene, anthracene, benzene (2006) What are aromatic compounds? What is the role of resonance energy towards stability of aromatic compound. (2007) Give a general explanation for electrophilic substitution of benzene. Give chemical equations showing all steps (with reaction conditions) for bromination, nitration and alkylation of benzene . (2007) How will you prepare aniline from each of the following substance : ……benzene ……benzamide …… bromobenzene (2008) Write a short note on huckel rule. (2008) (a) How will you synthesize the following starting from benzne: acetophenone , 1,3,5 –tribromo benzne , n – propyl benzne (b) In electrophilic aromatic substitution “halogen” are deactivating but o,p director . explain . (c) Sulphonation is reversible reaction at high temperature. Discuss its merit. (2009) How would you prepare the following compounds from benzene? Name each reaction as well: acetophenone , bromobenzene ,maleic anhydride , toluene , benzaldehyde (2010) How would you account for the following : ….. picric acid (2,4,6- trinitrophenol) liberate C02 to form aq. Solution of Na2CO3 but phenol does not ? …… benzne undergo friedal craft alkylation in presence of lewis acid while pyridine does not ? (2011) Starting from benzene how would you prepare the following compounds : benzoic acid , 4-bromonitro benzne , maleic anhydride (2011) How would you prepare the following compounds from benzene ? Name each reaction as well ? acetophenone , bromobenzne , maleic anhydride , toluene , benzaldehyde (2012) Starting from benzne , how the following can be synthesized… 1,3,5 tribromobenzne , benzne hexachloride , iodobenzne (2015)
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Me ne apne iraado ke tootney se Allah ko pehchana h... (Hazrat Ali) |
The Following 2 Users Say Thank You to shonNa For This Useful Post: | ||
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