Organic Chemistry Questions

Which of the following species will not have a formal positive charge on a carbon atom OA The Intermediate that forms when tert butyl alcohol reacts with hydrochloric acid after loss of water OB Any Intermediate from reaction of acetyl chloride and methoxybenzene OC An aromatic cyclopropenyl compound OD The intermediate from reaction of NaSPh with 2 4 6 trinitrofluorobenzene

hate solution 19 Which of the following reaction is a condensation Para formaldehyde HCHO CH CHO a b e CH3COCH3 d CH CH Polyethylene Paraldehyde Mesityl oxide rea

Q3 A How can we measure the aromaticity which of the following is aromatic put a circle 5 points H A Br H HO H or A H H B B H H B H B What is meant of 1 2 adduct and 1 4 adduct for the reaction of 1 3 butadiene with hydrobromic acid write the reaction 5 points OH H C Rank the following aromatic compound according to the order of reactivity of aromatic ring 5 points C H C H C H H D D Which of the following would be suitable to use when forming a Grignard reagent Put a circle 5 points NO NH CH D Br

Allyl chloride A hat is the name of enclosed reaction and B C D Fries rearrangement O H A 250 C X Claisen rearrangement O H CH CH CH O H Claisen rearrangement CH CH CH O H 6 CH CH CH Fries rearrangement P Q CH CH CH

99 A compound X when boiled with Na2CO3 solution gives glycol as the product What is X a Ethylene b Ethylene oxide c Ethyl bromide d Ethyl hydrogen sulphate CH CH tem Na CO3 2 On M OW

3 SO NO CH3 CH C Br CH CH OH CH CH CH C Br CH CH CHONG CH CH OH Possible products are 4 SO NO CH3CH OH B major A major 2 J 3 SO NO CH3 48 CH3 C Br CH3CH OH CH 3 CH3 1 4 SO NO CH3 C Br 1 CH3 CH3CH ONa CH3CH OH CH3CH OH A R B

5Brst A of formula C3H6Cl2 on reaction with alkali can give B of formula C3H6O or C of formula C3H4 B on oxidation gave a compound of the formula C3H6O2 C with dilute H SO4 containing Hg 2 C3H6O which with bromine and NaOH gave the sodium ion gave D of formula salt of C H4O2 Then A is a CH3CH CHC12 CH3 C C b CH3CCl CH3 CH3 CH d CH c CH CICH CH Cl

50 H3C s H C O 1 CH3 CHCH OH LIAIH A A is CH3 2 CH CH CH CH OH CH3 3 CH C OH CH3 for rough work 4 No reaction 50 3 I II IV H3C X O LIAIH H C 1 CH3 CHCH OH 4 I II III IV A A CH3 2 CH CH CH CH OH CH3 3 CH C OH CH 4 4 53

Identify the final product Z O H5C6 A C C CH2COOC2H5 C6H5 CH C C6H5 CH C CH3 CH3 COCH 3 COCH i NaH THF i CH COCI X KOH H O A B D Y CO C H OH CH CHO OH C6H5 CH C COOH COOH CH CH CH COCH

s synthesis 147 The number of methoxy groups in a compound can determined by treating it with a HI and AgNO3 c sodium hydroxide b sodium carbonate d acetic acid

Which of the following alcohols undergoes dehydrations upon heating with concentrated H SO with carbocation rearrangem Select all apply Points will be deducted for incorrect answers 2 methylhexan 3 ol 2 methyl 2 phenylpropan 1 ol 2 3 dimethylpentan 2 ol 3 3 dimethylpentan 2 ol 3 methylpentan 3 ol

Solvelancer Test Some statements are given about lime calcium oxide below 1 Calcium oxide lime is an amorphous white solid 2 It has a high melting point of 2273 K 3 Heating it at a very high temperature produces white light Which statement s is are true among them Solvelancer Test a Only 1 b Both 1 and 2 c Both 2 and 3 d All are correct a

3 Total compound a 1 2 214 3 6 4 8 geometri isomers in the given 49 ffu af Hicefort C CH DC CD HC C 1 2 2 4 1376 4 8 C CH DC CD HC 50 CH 3m Ma 2 are t 2 2 23 2 1 1 2 CH C CH CH CH CN CH TIUPA

find out weather there is a reaction if there is complete and balance it if there is no reaction write down no reaction Ca HCI Sb H2o with heat Al H2o with heat Pb CuNo5 Fe NaCl

H H C CIH 3 Select the correct option for stability of following resonance 23 f3st structures Hjal FEI 0 OCH 0 X 1 x y r CH 0 y 2 z y x Z CH 8 0 X 1 x y 3 y x

For zero order reaction which is correct relation between t1 2 and initial reactant concentration R o t1 2 R 0 t1 200 1 R o t1 2 R hr min t1 2 is independent of R o

Resonance is not shown by Question Type Single Correct Type 1 2 3 4 O C CH CH CH CH

48 Y Answer the following by appropriately matching the lists based on the information given in paragraph Consider the compounds given in List I and the number of monohalogenated products in List LIST I P 1 P 11 R CH3 H C CH CH CH CH3 CH3 H C C C CH3 CH3 CH3 III CH3 T H C CHCH3 IV 5 H CCH2CH2CH A 1 P C II S Q R A II P C IV T S T 4 6 1 2 3 5 Which of the following options has the correct combination considering List I and List 11 Options B 1 Q D IV R LIST II Which of the following options has the correct combination considering List I and List II Options B III R D II Q

Q 33 Hydrocarbon P on heating produces 1 3 butadiene without any side products How many hydrogen atom s is are present in P Your Answer 8 Correct Answer 6 Rate this que

5 cis 2 Butene CH3 f CH H 1 H 2 H 4 Br 3 H C Br H C HO CH CH CH H CH H OH Br OH H HOBr OH H Br H P Identify product Pis 153 Jyr 65 cis 2 Butene HOBr H g 1 H 2 11 Br 3 4 H C Br OH H C HO CH CH3 OH Br CH CH OH H CH H H CH H Br En Pfer c s Anti F 71 Anti 72 288 270 146 18 78

are Enantiomers The relative reactivities of acyl compounds towards 3 nucleophilic substitution are in the order of 1 Acylchloride Ester Acid anhydride Amida fi 1 m

Some reactions are given below out of which the correct combination is Reactant Reagent Major Product 1 CH3CH CH Cl 500 C CH3CH CH CI 2 CH3CH CH HBr H2O2 CH3CH CH Br 3 CH3CH CH HBr 4 CH3CH CH HCI 1 2 3 CH3CH CH Br CH3CH CH CI

Negative hyperconugation 4 All of these 48 Which is aromatic a c 1 a b c 2 a b c d 3 a c d 4 b c d b H N d N N N N 48 4 B a c 1 a b c 2 a b c 3 a c d

n 3 show geometrical isomerism QNo 48 Which among the following compound show goomctrical isomerism O 3 Your Answer 4 Stotus incorrect CH CEC CH3 CH3 H2 Cl Br Complete Quest A

47 m directing character of Caused by 1 I effect 2 m effect 3 Negative hyperconugation 4 All of these 48 Which is aromatic C Cl is CI 47 48 1 I C 2 m 3 T 4 BUR

2 asymmetry 3 External compensation 4 Two asymmetric carbon atoms The pair of structures given below represents CH CH CH H CH CH HO 1 Enantiomers 3 Identical CH HOW H 2 Diastereomers 4 Position isomers 1 antas 4 2 faran e 3 24 fari 4 fura 21 H mi CH HO 1 1 ufafara 3 47 F 2

5 Match column A catalyst with column B process B A 1 SiO2 2 Pt 3 Zeolites 1 1 1 2 II 3 III 3 1 II 2 III 3 I I Cracking of Hydrocarbon II of benzene III Automobile converter 2 1 III 2 II 3 1 4 1 III 2 I 3 II

Which one is a right statement for the isomerism Choose every one Geometrical isomers are the same as the stereoisomers Structural isomers is different from the constitutional isomers There are two major groups in isomerism structural and stereo isomers One of condition for being isomers between two compounds is having the same molecular formul

Reactant CH3 KOH a CH3 OH CH3 OH a CH3 OH CH OH H SO Conc 1 NaH 2 CH 1 HBr 2 Mg 3 CH l 1 Na 14 2 CH p G r Products CH3 14 OCH3 CH3 CH3 CH3 OCH CH3 OCH

a b c d 2 Only a c d 3 Only c d 4 Only b c d Correct order of heat of hydrogenation a CH CH b N c CH C CH CH d CH CH CH 1 b c d a 2 b c a d 3 a b d c c b a d 6 3 a b c d c d a CH CH b N c CH C CH CH d CH CH CH 2 1 b c d a 2 b c a d 3 a b d c 4 c b a d 2 da c d 4 b c d

H D H 1 3 D H N D CH3 duct is Br H H H NaN DMF CH3 CH3 he vanours of an alcohol Y aro H H A LIAIH4 ii H O 20 2 B 4 None NO H CH3 D BEN D chy 57 re CH3 H 1 H D 3 N D CH3 NENEN EAR ESR FSR NSR Solid State Batch Br NaN H H H CH H LIAIHA DMF A ii H O SNS 3 2 4 B NO CH3

Which of following is are correct Question Type Single Correct Type 1 2 3 H H H O is Aromatic O H H OH H H H O H OH H H Stability H O H

Identify the true statement regarding which of these structure is a better representation of the real molecule and why A AJ N H H 0 N H These are equivalent resonance structures in terms of formal charges and electronegativities The structure on the right is favored because it has lower formal charges The structure on the left is favored because it has lower formal charges The structure on the right is favored because it puts the negative formal charge on the more electronegative atom The structure on the left is favored because it puts the negative formal charge on the more electronegative atom

The compound s which show Keto enol tautomerism is ar II III I only II only hr min II and III only

U Why medicine bottles are mostly orange or in shades of brown Orange brown are the most commonly used colours because of their ability to prevent UV light from damaging or degrading any photosensitive contents that are prone to photochemical reactions 618 boml 99 E 92 E 50

NEET CHEMISTRY All India Major Test Series Phase I II Major Test 28 22 03 06 2020 Q 139 An organic compound A on treatment with Q 139 AN NH gives B which on heating gives C C when treated with Br in the presence of KOH produces ethylamine Compound A is 1 CH CH COOH 2 CH COOH 3 CH CH CH COOH 4 CH CHCOOH CH BCC Br er KOH 1 CH CH COOH 2 CH COOH 3 CH CH CH COOH 4 CH CHCOOH CH fra A

4 Show how to make benzene from cyclohexene Show all the intermediates and reagents used 2 pts 5 Show how to accomplish the following conversion Show all the intermediates and reagents used 2 pts o

320 Which of the following is correct order i p CH CHO Ph CHO CH C CH Ph C Ph Reactivity in nucleophilic addition reaction NAR q Ph C Cl Ph Reactivity in hydrolysis CHO u CH CHO COCI COCI CH Ph C OR Ph C NH OCH CH Reactivity in nucleophilic addition reaction NAR COOH FO CHO COCI CN Reactivity in hydrolysis t HCHO CH CHO CH CO Ph CHO Reactivity towards Grignard reagent COOH Rate of decarboxylation 1 p q CHO NO 2 r s t COCI NO COOH

9 CH3 CH CH HBr CH3 Br 1 CH3 CH2 C CH3 1 CH3 CH3 2 CH3 CH CH CH Br CH3 3 CH3 CH C CHz 1 Br CH3 Br 4 CH3 CH CH CH3 CH3 perosade

TK for Review Which of the following pair of compounds can be distinguished by isocyanide test NH and CH NH CH NHCH3 and CH3 N CH3 I CH CH CH NH and CH NH CH NH I CH CH NH and CH3 CH CH3 hr

8 A 5 solution of cane sugar molecular weight 342 is isotonic with 1 solution of substance X The molecular weight of X is 1 171 2 2 68 4 3 34 2 4 136 2

This is solution of my previous doubt here how do I know which is R and which is R Example for butanoic ethanoic anhydride will butyl or ethyl attach to benzene ring and w hy Ex 1 R O 11 C Anhydride O 1 R 0 R Alel3 R Deylation 14 Ale 3 C R

Which of the following is correct order of reactivity A B Vinyl chloride Altyl chloride Propyl chloride Propyl chloride Vinyl chloride Allyl chloride

1 I II 3 I II III 4 II III IV Which of the following statements about the conformer that result from rotation about the C C3 bond of butane is correct 1 Torsional strain is absent in the eclipsed forms 2 Steric strain is absent in the eclipsed forms 3 The gauche conformer is an eclipsed one 4 The highest energy conformer is one in which methyl groups are eclipsed by hydrogens 5 None of the above

21 Compound P on treatment with NaOH gives major product Q Predict the correct stereochemical descriptor for P and Q OTS coro P A P is R and Q is S B P is R and Q is Racemic C P is S and Q is R D P is S and Q is Racemic NaOH Q

What relationship can be used to find the mass of H O that can be produced from complete reaction of 3 moles of NaOH in the shown reaction 3 NaOH H3PO4 Na3PO4 3 H O a 3 mol H O X b 3 mol H O X c 3 mol NaOH X d 3 mol NaOH X e none correct OC Ob 40 00 g NaOH 3 mol NaOH Oe Od 3 NaOH 3 H20 3 H20 3 NaOH 3 H20 3 NaOH X X X X 1 mol H20 18 02 g H20 40 00 g NaOH 1 mol NaOH 1 mol NaOH 40 0 g NaOH 18 02 g H20 1 mol H20

5 CH CH CH 1 CH CH CH3 CH CH CH CH CH CH3 CH CH COOH CH3 CH CH CH CH3 OH i 6 CH3 CH CH C CH3 7 CH CHO CHO 1 CH3 CH CH CH3 8 9 CH3COOH CH CH CH

181 Which of the following undergoes dehydration readily a 1 phenyl 1 butanol L c 2 phenyl 2 butanol nd b 1 phenyl 2 butanol d 2 phenyl l butanol

Identify the reagent used in the following transformation HO A B C D OH P LiAlH P NaBH MeOH P CeCl 7H O P HO P NaBH CeCl 7H O Q KMnO4 OH OH MnO CH Cl Q Ag CO on celite PhH Q MnO CH Cl Q OH

Among the following pairs of orbitals which orbital will experience the larger effective nuclear charge i 2s and 3s ii 4d and 4f iii 3d and 3p a 4f 3d and 3s respectively b 2s 4d and 3p respectively c 2s 4d and 3d respectively d 4d 3p and 2s respectively