tag:blogger.com,1999:blog-6316488953659692672024-11-01T02:42:39.629-07:00For all examsUnknownnoreply@blogger.comBlogger246125tag:blogger.com,1999:blog-631648895365969267.post-4399972442512472292016-04-28T05:13:00.000-07:002016-04-28T05:13:09.430-07:00

Epoxide Formation In order to form an epoxide, a electron-rich reagent is required, such as an alkene.  Formation of the epoxide occurs in the presence of a peroxide reactant, such as MCPBA or DET.  The choice of reagent depends on the stereo-specificity desired from the reaction.  MCPBA is used to add the epoxide symmetricaly across the double bond, so that substituents

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Here is a look at a reaction directly from our proven organic chemistry flash card system: Esterification of Acid Chloride Overall Big Picture: In this reaction, an acid halide is reacted with an alcohol to give an ester. Acid Chloride + Alcohol → Ester Key Tip: A mild base is required to drive the reaction forward. Key Comparison: This reaction is only possible due

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1. The enthalpy of vaporization of benzene is +35.3 kJ/mol at its boiling point of 80°C. The entropy change in the transition of vapour to liquid at its boiling point is ______. [in J mol–1 K–1] (A) +100 (B) –100 (C) –342 (D) +342 Answer: (B) 2. The formation of [

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-631648895365969267.post-35673343528382484772012-12-16T05:50:00.000-08:002012-12-16T05:50:00.558-08:00

1. The amount of heat evolved when 500 cm3 of 0.1 M HCl is mixed with 200 cm3 of 0.2 M NaoH is (A) 2.292 kJ (B) 1.292 kJ (C) 22.9 kJ (D) 0.292 kJ Answer: (A) 2. The amount of the heat released when 20 ml 0.5 M NaOH is mixed with 100 ml 0.1 M HCI is ´ kJ. The heat of neutralization is (A) –100

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-631648895365969267.post-78818392961884613412012-12-12T05:42:00.000-08:002012-12-12T05:42:00.045-08:00

1. Methyl bromide is converted into ethane by heating it in ether medium with (A) Al (B) Zn (C) Na (D) Cu Answer: (C) 2. Monobromination of 2-methylbutane gives how many distinct isomers? (A) One (B) Two (C) Three (D) Four Answer: (D) 3. More acidic than ethanol is (

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1. In the conversion of X is (A) H2/Pt (B) Zn-Hg/HCl (C) Li/NH3 (D) NaBH4 Answer: (D) 2. In the conversion of Br2 to , the oxidation number of Br changes from (A) zero to +5 (B) +1 to +5 (C) zero to -3 (D) +2 to +5 Answer: (A) 3. In the following electron – dot structure, calculate the formal charge from

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-631648895365969267.post-60071435488039097182012-12-12T05:35:00.000-08:002012-12-12T05:35:01.262-08:00

1. Following is the substitution reaction in which ¾CN replaces ¾Cl R – Cl + R – CN + KCl To obtain propanenitrile, R-Cl should be (A) 1- chloropropane (B) chloroethane (C) 2-chloropropane (D) chloromethane Answer: (B) 2. For a chemical reaction of the type A Ý B, K = 2.0 and

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-631648895365969267.post-22612632837115390492012-12-09T05:36:00.000-08:002012-12-09T05:36:00.367-08:00

1. Given reaction Y in the reaction is (A) Hexane (B) Cyclohexane (C) Cyclohexylcyclohexane (D) Cyclohexylether Answer: (B) 2. Given the following reactions involving A, B, C and D (i) C + B+ ® C+ + B (ii) A+ + D ® No reaction (iii) C+ + A ® No reaction (iv) D + B+ ® D+ + B The correct arrangement

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1. An element belongs to Group 15 and third period of the periodic table. Its electonic configuration will be (A) 1s22s22p3 (B) 1s22s22p4 (C) 1s22s22p63s23p3 (D) 1s22s22p63s23p2 Answer: (C) 2. An example for autocatalysis is (A) oxidation of NO to NO2 (B) oxidation of SO2 to

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1. Based on the first law of thermodynamics, which one of the following is correct? (A) For an isochoric process, ΔU = -q (B) For an isochoric process, q = +w (C) For a cyclic process, q = -w (D) For an adiabatic process, ΔU = -w Answer: (C) 2. DG0 Vs T plot in the Ellingham's diagram slopes

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1. Which of the two ions from the list given below that have the geometry that is explained by the same hybridization of orbitals, ? (A)  and (B)  and (C)  and (D)  SCN- and Answer: (B) 2. Which one of the following conformations of cyclohexane

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1. Which of the following forms a colour less solution in aqueous medium? (A) Ti 3+   (B) Sc 3+ (C) V 3+ (D) Cr 3+ Answer: (B) 2. Which of the following has the maximum number of unpaired  'd' electrons? (A) Zn2+ (B) Fe2+ (C) Ni3+ (D) Cu+

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-631648895365969267.post-67185343982126363782012-12-05T05:21:00.000-08:002012-12-05T05:21:00.862-08:00

1. Thermodynamic standard conditions of temperature and pressure are (A) 0°C and 1 atm (B) 273 k and 101.3 k Pa (C) 298 k and 1 atm (D) 0°C and 101.3 k Pa Answer: (C) 2. Three moles of PCl5, three moles of PCI3 and two moles of Clz are taken in a closed vessel. If at

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1. When KBr is dissolved in water, K+ ions are (A) oxidised (B) reduced (C) hydrolysed (D) hydrated Answer: (D) 2. When sulphur dioxide is passed in an acidified K2Cr2 O7 solution, the oxidation state of sulphur is changed from (A) + 4 to 0 (B) + 4 to + 2 (C) + 4 to + 6 (D) + 6 to + 4 Answer: (C

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1. The spin only magnetic moment of Mn+4 ion is nearly ______. (A) 6 BM (B) 3 BM (C) 5 BM (D) 4 BM Answer: (D) 2. The standard electrode potential for the half cell reactions are: Zn++ + 2e- ¾¾¾® Zn E° = - 0.76 V Fe++ + 2e- ¾¾¾® Fe E° = - 0.44 V The E.M.F. of the cell reaction : Fe++ + Zn ¾¾¾®

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-631648895365969267.post-69517315457327436362012-12-02T05:15:00.000-08:002012-12-02T05:15:00.686-08:00

1. The monomers of Buna-S rubber are (A) vinyl chloride and sulphur (B) butadiene (C) styrene and butadiene (D) isoprene and butadiene Answer: (C) 2. The noble gas mixture is cooled in a coconut bulb at 173 K. The gases that are not adsorbed are (A) He and Ne (B) Ar and Kr (C) He and Xe (D) Ne and Xe

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-631648895365969267.post-7740251869600239842012-11-28T05:17:00.000-08:002012-11-28T05:17:00.240-08:00

1. Which one of the following is wrongly matched? (A) [Ni(CO)4] - neutral ligand (B) [Cu (NH3 )4]+2 - square planar (C) [Co (en )3 ]+3 - follows EAN rule (D) [Fe (CN )6]-3 - sp3d2 Answer: (D) 2. The oxidation state of iron in K4 [Fe (CN )6] is (A) 2 (B) 3 (C) 4 (

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1. The general formula of a cycloalkane is (A) CnH2n + 2 (B) CnH2n - 2 (C) CnH2n (D) CnHn Answer: (C) 2. The incorrect statement in respect of Chromyl chloride test is (A) formation of Chromyl chloride (B) liberation of Chlorine (C) formation of red vapours (D) formation of lead chromate Answer: (B

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1. The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (A) [Cr(H2O)6]2+ (B) [Mn(H2O)6]2+ (C) [Fe(H2O)6]2+ (D) [Co(H2O)6]2+ (At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-631648895365969267.post-8066199412010960792012-11-25T05:04:00.000-08:002012-11-25T05:04:00.452-08:00

1. The compound which forms acetaldehyde when heated with dilute NaOH is (A) 1 Chloro ethane (B) 1, 2 Dichloro ethane (C) 1, 1 Dichloro ethane (D) 1, 1, 1 Trichloro ethane Answer: (C) 2. The compound which is not founded during the dry distillation of a mixture of calcium format and calcium

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1. The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with (A) SOCl2 in presence of pyridine (B) Dry HCl in the presence of anhydrous ZnCl2 (C) PCl3 (D) PCl5 Answer: (A) 2. The calculated bond order of super oxide ion ( ) is (A) 2.5 (

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1. Presence of halogen in organic compounds can be detected using (A) Beilstien's test (B) kjeldahl test (C) Duma's test (D) Leibig's test Answer: (A) 2. Rate of physical adsorption increases with (A) decrease in pressure (B) increase in temperature (C) decrease in surface area (D) decrease

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1. Of the following which one is classified as polyester polymer? (A) Nylon-66 (B) Terylene (C) Backelite (D) Melamine Answer: (B) 2. One dm3 solution containing 10-5 moles each of Cl- ions and CrO ions is treated with 10-4 mole of silver nitrate. Which one of the following observations is

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1. Mesomeric effect involves delocalisation of (A) pi electrons (B) sigma electrons (C) protons (D) none of these Answer: (A) 2. Methoxy methane and ethanol are (A) Position isomers (B) Chain isomers (C) Functional isomers (D) Optical isomers Answer: (C) 3. Mg+2 is isoelectronic

Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-631648895365969267.post-13560075951801593642012-11-21T04:54:00.000-08:002012-11-21T04:54:00.395-08:00

1. Which one of the following statements is true'? (A) Drying of oil involves hydrolysis (B) Saponification of oil yields a diol. (C) Refining of oil involves hydrogenation (D) Addition of antioxidant to oil minimizes rancidity Answer: (D) 2. IUPAC name of (CH3)3CCl (A) 2 chloro 2 methyl propane

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