Organic Chemistry Questions

What is the major E2 product formed in the following reaction Br H3CO A C H3CO Both A and B 11CH3 CH3 NaOC H5 B D H3CO No reaction CH Activate Windo

Following compounds are separately treated with iodine an NaOH OH ool of 1 iii The compound s which will give yellow precipitate is are i and ii only ii and iii only ii only i ii and iii

please tell what is leaving group in A C and D Question 39 Consider the following compounds A CH COOCH B CH a 8 0 8 04 C CH D CH C S C CH S 8 CH The correct order of rate of nucleophilic acyl substitution reaction is Options B A C D B C D A B D C A D B C A Solution Answer 3 Rate of nucleophilic substitution reaction x strength of leaving group

COH A 1 Question Type Single Correct Type B Product The product is benzamide derivatives The reaction of C with A to form product is known as Hoffmann bromamide reaction A G An C JA A OH

Which of the following is correct Only one correct answer A B C D CH CH OH CH CH OH I CH OH 1 CH C CH T CH OH C H C CH 573 K Cu 573 K Cu 573 K Cu 573 K CH CH CH CH CH CH C CH I CH OCH C H C CH3 CH

The value of van t Hoff factor i will be equal to 2 for Ourea Oglucose O sucrose NaCl Which one of the following salts would have the same value of the van t Hoff

Percentage of free space in cubic close packed structure and in body centred structure are respectively 1 48 and 26 2 30 and 26 4 32 and 48 3 26 and 32

An alkene A on reductive ozonolysis gives two aliphatic aldehydes B and C These B and C react with each other in the presence of aqueous K CO3 to give compound R R is on reaction with CH3MgX followed by hydrolysis gives the following compound 37 The compound A cannot be A B D CH I HO CH C CH OH II CH CH

The reaction by which benzaldehyde cannot be prepared is CN CH CN i SnCl HCI ii H O i CrO CH CO O 273 283 K ii H O 1 CH MgBr ii H O CO HCI anhyd AICI CUCI

43 Two ionic solids AB and CB crystallize in the same lattice If rare and re r Co Ir are 0 50 and 0 70 respectively then BO A BO the ratio of edge length of AB and CD is 1 0 68 3 0 88 2 0 78 4 0 98

Consider the following statements a Methylamine is a stronger base than trimethylamine in aqueous medium b Direct nitration of aniline using nitrating mixture at 288 K gives p nitroaniline as major product c Anilinium hydrogensulphate on heating at 453 473 K gives sulphanilic acid The correct statements are a and b only b and c only a and c only a b and c

AbxH CH ct TS more stable Reaction proceed via six membered cyclic transition state ence pericyclic CH CH 03 Oh

distance PO is equal to 1 R 2 3 R 3 2 R of this combination is 1 1D 2 9D 4 5 R GO0056 LENSES 7 Two convex lens of focal length 20 cm and 25 cm are placed in contact with each other then power 3 1D 4 9D

Alkyl halides can be obtained by all methods excepts CH3 CH OH HCI ZnCl B CH CH CH HBr C H5OH NaCl CH COOAg Br CCI h

54 Compound X reacts with diborane followed by alkaline hydrogen peroxide to form compound Y Y on reaction with a mixture of sodium bromide in sulphuric acid followed by bromobenzene and sodium in ether gives n pentylbenzene Compound X is 0 A B D

Holloway Julia 12 48pm 10 82 Identify each of the following as an acid base or salt and give its name 10 1 a H3PO4 b MgBr c NH3 d HClO2 e NaCl

18 An organic base X reacts with nitrous acid at 0 C to give a clear solution Heating the solution with KCN and cuprous cyanide followed by continued heating with conc HCl gives a crystalline solid Heating this solid with alkaline potassium permanganate gives a compound which dehydrates on heating to a crystalline solid X is CH NH A C CH 3 H N CH 3 CH 3 NH B D CH 3 NH CH D

The given reaction is called CH3CH COCHZHCH CH CH CH3 Wolff Kishner reduction Stephen reduction Clemmensen reduction hr

22 The best reaction sequence to convert 2 methyl 1 bromopropane into 4 methyl 2 bromopentane is A i Mg in ether ii acetaldehyde iii H H 0 iv A v HBr H O B i NaC CH in ether ii H Lindlar catalyst iii HBr no peroxide C i alcoholic KOH ii CH3COOOH iii H Pt iv HBr heat D i NaC CH in ether ii H O HgSO4 iii HBr heat B

Which of the following pairs will show the same magnetic moment spin only 1 3 Cr H O and Fe H O NO 2 Mn CN and Fe CN 6 3 3 Ni CO and Zn NH3 4 2 4 All of these Vanes ACA 00 0 7 0 00 2

5 Allylic and benzylic halides show high reactivity towards the SN1 reaction 7 For a given alkyl group the reactivity of the halide R X follows the same orde both SN1 and SN2 mechanisms R I R Br R Cl R F R A SN2 reaction proceeds with complete stereochemical inversion while a SNI

1 2 3 acidic order of acidity is 4 OH OH OH OH 66 66 CH at para CM3 1 hyprccenjingatican OH OH OH OH OH 66 66 CH3 OH CH3 OH OH CH3 CH3 CH3 OH CH OH CH3 CH3 OH CH3 OH

How come opt 2 be the answer What s wrong with opt 4 Please try to brief the underlying concept here 2 Most stable radical among the given options is 1 CH 3 CH 2 CH CH CH CH 4 CH C CH

When nitrogen gas is treated with hydrogen gas in the presence of a catalyst at 773 K ammonia gas is formed This reaction is in example of O Displacement reaction O Combination reaction Decomposition reaction O Double displacement reaction

6 4 Methane Physical and Chemical Properties of Aldehydes and Ketones n SeO A A HIO4 D B Cao H SO5 A C and D are respectively 1 Adipic acid 8 lactone 2 Cyclobutane y lactone 3 Cyclobutanone 8 lactone 4 Adipic acid y lactone In the reaction C 9

CH3 C CH3 O H SO4 C Hg 12 A io Na CO3 Ag powde 8 Product A B Care A Iodoform Acetylene Acetaldehyde B Tri iodomethane Ethyne Acetone C Iodoform Ethene Ethylene glycol form Ethylhydrogen sulphate

The compound which will undergo nucleophilic addition reaction at fastest rate is CHO CHO OCH3 CH3 OCH3 CHO

A B H i H C Structure of B is Identify correct statement for A and B products a Structure of A is Structure of A is OH ii NH NH OH A iii H O iv LiAlH4 v SOCI Structure of B is a A H i PPh3 ii BuLi iii MeO LOMe H iv H3O

head tail 10 H N CH n COOH mol wt x head tail HOOC CH m OH Product mol wt y If product has mol wt x y 18 then it is ar example of 1 Head to head condensation 2 Head to tail condensation 3 Tail to tail condensation Roth 1 3

59 Which alcohol produces turbidity with lucas reagent most slowly 1 2 Butanol 2 t Butyl alcohol 3 Isobutyl alcohol 4 Diphenyl carbinol 59 2 c Cfs f LL ENTHUSE LEADER ACHIEVER ALPHA PLUS SPARK CRASH COURSE ge 16 56 Space for D

Which reagent or sequence of reagents would bes accomplish the following synthesis OEt datio imited 1 i LIAIH4 ii H A 2 i NaBH4 SO4 iii conc H SO4 dil 3 i Na NH3 ii NaBH H A 4 i Mg Et O ii LIAIH iii H A

Osmotic pressure for colloidal solution comparing to true ones is Select one O a less O b more c equal d an addition information is needed Previous page Next page

Use the information below for Part H Parti For the reaction 21 S 08 2SO4 1 It was found that under a given set of reactant concentrations it took 7 seconds for the iodine 1 concentration to change by 4x10 5 M Part H Calculating average rate Calculate the average rate of iodine production over this time period Give your answer to 3 significant figures View Available Hint s d 1 dt AEO mol L 1 S 1

Identify x and y in the following sequence C H5Br product C3H7NH2 X Question Type Single Correct Type 1 2 3 4 x KCN y LiAIH4 x KCN y H3O x CH3CI y AICI3 HCI x CH NH v HNO

1 What is the correct reactivity order of electrophilic addition reactions in the following compounds 6 B IV III II I 1 A II IV I III 11 III C III I IV II IV C H D I II III IV

Using structural formula provide equations to show how you could synthesize the following compounds Reaction conditions and reagents must be included Multiple steps may be required 4 marks a 1 chlorobutane butanoic acid b cyclopentanol cyclohexane

Which among the following is not a synthetic detergent CH CH 10 CH OSO Na CH CH 11 SO a hr mir CH3 CH2 16COO CH CH O CH CH OH

Which of the following cannot be made by using Williamsons synthesis A B Methoxybenzene Benzyl p nitrophenyl ether C Methyl tertiary butyl ether D Di tert butyl ether

38 When 2 Bromooctane of specific rotation 34 6 is converted into the alcohol under the conditions of first order kinetics 2 octanol of specific rotation 3 6 is obtained The conversion can be explained by 1 Free radical mechanism 2 carbonium ion mechanism 3 carbanion mechanism 4 chain reaction

Column I A CH3 COCH2 COOH B CH3 CH OH COOH C CH2 OH CH2 COOH D COOH CH2 C O CHOH CH COOH p q Column II CO lost due to heating lodoform test positive r a unsaturated acid formed due to heating s Lactide formation due to heating

The stereochemistry configuration of enantiomers are called R and S To assign this nomenclature to a chiral carbon in the following molecule CH H H C OH w CH CH C H CH you first have to assign the ranking of the four groups attached to the chiral carbon of the molecule The H atom has the lowest rank which is assigned number 4 Rank the remaining 3 groups from highest to lowest that is 1 2 3

41 What is the major organic product of the following reaction CH CH NHCH CH3 iii a i C H5 C H5 C H5 C H5 b ii ii iv OH N C H5 C H5 N C H5 C H5 c iii v d iv CH CH e v

In the given sequence of reactions the products A and D are respectively OH A O conc HNO3 conc H SO4 Heat i NaOH ii CO heat B dil HCI 2 4 dinitrophenol and salicylic acid C picric acid and salicylaldehyde 2 4 6 trinitrophenol and phenyl salicylate O Opicric acid and 2 acetoxy benzoic acid CH3COCI CH3COOH pyridine D

CH C a CH3 2 3 dimethyl 2 butarie 0 025 mole CH3 CH3 TMAO CH3 0 034 moles TMAO trimethyl amine N oxide Product A is OsO 10 mole CH3 3 N 0 H O CH3 CH3 c CHg C CH A CH 3 N CH3 CH3 b CH C C CH3 OH OH O 11 d CH3 C C CH3 3

38 Write the IUPAC name of H CH C CH CH CH C CH a b 1 OH 6 6 dibromoheptan 2 ol 2 2 dibromoheptan 6 ol c 6 6 dibromoheptan 1 ol d none of these a T S P b S T P 39 When phenol is treated with CHCl3 and NaOH the product formed in a Benzaldehyde b Salicylaldehyde c salicyclic acid d benzoic acid 40 Order of esterification of alcohols is C P S T d P T S Br 41 When ether is exposed in air for sometime an explosive substance produced is a Peroxide b TNT c Oxide d super oxides 42 Lucas test is used for distinction of a Alcohols b Phenols c alkyl halides d aldehydes 43 IUPAC name of the compound CH CH CH CH CH is T OH CH3 Br a 4 methylpentene 2 ol b 2 methylpentanol 4 c 4 4 dimethyl butan 2 ol d 4 methylpentan 2 ol

An organic compound vapour density 37 contains 48 65 Carbon 8 11 Hydrogen and rest Oxygen The compound forms silver mirror on reaction with Tollen s reagent forms yellow precipitate with NaOl and gives positive 2 4 DNP test The compound doesn t contain any chiral atom Which of the following statements is correct The compound doesn t form acrolein on dehydration The compound doesn t undergo aldol condensation The compound doesn t give addition product on reaction with NaHSO3 The compound doesn t evolve hydrogen on reaction with Na metal

example of a motif is the helix turn helix motif which can have DNA binding activity At whic rotein structure does a motif belong one of the above between secondary and tertiary etween tertiary and quaternary Sove quaternary etween primary and secondary

Which of the following reactions is are correctly interpreted CI 1 CH CECH 2 equiv HCI CH CH CH CI i CH C CH Ph Ph C CCH II CH CEC Ph H O III CH CEC Ph Br IV O O CH HBr I only R O ho III and IV only O O I II III and IV I and II only Hg 2 H Br H Br CH H Br H Br H CH

Which of the following practices will not come under green chemistry A If possible making use of soap made of vegetable oils instead of using synthetic detergents B Using H O for bleaching purpose instead of using chlorine based bleaching ager C Using bicycle for traveling small distances instead of using petrol diesel based vehicles D Using plastic cans for neatly preserving substances

Which combination of organic bromides and dicarbonyl compound can be used to prepare the following ketone in a multistep synthesis O CH3CI CH CH CI ii Br