General organic chemistry Questions and Answers

lion 1 5 Then rium 9 Major product of the given reaction is 1 8 Br K Br HBr Product 2 F Br Br

Partial reduction b Partial oxidation c Complete reduction d Complete oxidation 2 A Define electron gain enthalpy Explain why group 17 elements have large egative electron gain enthalpies and group 18 elements have high positive electron gain enthalpies 3 marks

70 Carbonyl compounds when treated with sodium bisulphite cc solution generally a crystalline sodium bisulphite addition product is formed but which of the following carbonyl compound not forms crystalline addition product a HCHO b CH3CHO Na HS c CH3COCH 3 71 Main product of the reaction is bu oby d C H5COC H5 all aldeh methyl ke

1 Among the given pairs in which pair first compound reacts faster than second compound in S SN1 reaction a CH3 CH2 CH CH2 Br or CH3 CH 2 CH CH3 THE Br CH 3 CH 3 b CH3 C CH CH or CH3 CH CH CH3 Br Br C Br 6 6 or CH 3 1 d CH3 C CH3 11 ve Br Br CH 3 or CH3 C CH 3

Please solve the following 18 electron problem using two types of ionic and covalent models Ph P Ph OC OC OC RO Os BH RO Au Au co OR OR OR RIC W R CH O Co Co 8 Br CH t Bu Au t Au 1 CH3 Rh O Rh R

hich of the following pair s is are resonating structures e CH CH CH CH CH3 and CH CHCH CHCH e CH CH CH CH CH and CH CH CHCH CH CH CH CH and CH CHCH 15 CH CH CH CH CH and CH CH CH CH CH

49 How many terminal alkynes isomers are possible for the formula CeH10 O No 49

H of D H3C OH Which statement is correct SOCI SOCI Pyridine X y x and y are superimposable mirror images x and y are non superimposable mirror images O x and y are neither mirror images nor super imposable x and y are structural isomers

How many of the following elimination takes place via E1CB mechanism Br OH H C CH CH C CH3OH H3C CH CH C CH3 MeO Ph O C H5O A NO 2 H MeO A H3C S CH CH OPh Ph NaOD D 0 A NO 2 01S H C S CH CH

C 1 In which of the following bond angles on sp hybridized are not contracted due to lone pair of electron 6 110 a OF b H O c CH3OCH3 3 R N d CH OH M 10 with ammonia and passed over

1 Compare relative stability of following resonating structures CH 0 CH CH C N a e CH 0 CH CH C N a a b c d b a c d b se CH O CH CH C N b CH O CH CH C N d c a d c b 6 d c d b a

Number of hyperconjugation resonance structures of BH3 CO x Number of hyperconjugation resonance structures of BH3 PF3 Y Choose the correct relationship O x y 3 O O O x y 3 x y none of these

D Which of the following is most reactive toward S N2 Cl Cl a CH3 b c reaction wollot orb to ridw Cl Cl NO2 1 Cl naim in which pair first compound reacts faster than second compou

110 Vapours of an alcohol were passed over hot reduced copper On It gave an olefin The alcohol is a primary c tertiary b secondary d none of these 24 CU 2

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

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

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

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

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

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

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

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

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

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

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

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

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

H2N CH2CH2CH CH2 CHO product is Only One Correct Answer B A H N CH CH CH CH2 CH OH C H Ni CN NH A O

13 Correct order of basic nature is 1 C H NH C H5NH C H 2N NH3 2 C H NH C H 3N C H NH NH3 3 C H NH C HyN CH NH NHg 4 NHg C H NH C H NH C HJgN

Serratia marcescens is a bacterial species that produces a red pigment when grown at 25 C and remains colorless at 37 C What is t O Mesophilic bacteria are adapting to a lower temperature The environment is expressing a phenotype A change in the genotype The protein being inactivated at high temperatures O Temperature rearranging the gene sequence

Arrange each set of compounds in order of increasing boiling points CM3 Br 1 Bromomethane Bromoform Chloromethane Dibromomethane ii 1 Chloropropane Isopropyl chloride 1 Chlorobutane

As it is directly proportional to no Of pi bond than why be nzene is in middle For the reactions 211 31 Select the correct option Question Type Single Correct Type 1 y z x 2 x z y AH x Kcal mol 1 AH y Kcal mol AH z Kcal mol 3 z x y 4 z y x

The addition of a catalyst during a chemical reaction alters which of the following quantities Internal energy Enthalpy Activation energy Entropy

iv none of the above b The correct order of acidic strength among the followings II CH3CH OH III C H OH 1 H O i III IV II I iii IV III II I ii IV III I II iv I II IV III IV p chlorophenol

No 50 Select incorrect statement about following molecule 1 Correct Answer 4 Your Answer 1 Status incorrect MENO It is less basic than aniline One of the resonating structure of this molecule shows geometrical isomerism Tautomer of this molecule shows geometrical isomerism It is less basic than CH CONH

4 In ethers the grou considered as a substituent in RH where a R is higher than R b R and R are same c R may be higehr than or same as R d R is smaller than R

Which is the correct order of increasing basicity A CH3CH CH3 CH3CH SH CH3CH OH CH3CH2NH2 B CH3CH CH3 CH3CH OH CH3CH SH CH3CH NH2 C CH3CH NH2 CH3CH SH CH3CH OH CH3CH CH3 D CH3CH CH3 CH3CH OH CH3CH NH CH3CH SH

Which of the following choices represent s a pair of resonance forms Mark all that apply 0 0 11 CH CH CH H H w propere OH CH CH CH H C CN H CH CH OCH CH CH OCH onance