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Aminoacids and Heterocyclic compounds

Total questions: 80

Worksheet time: 40mins

Name
Class
Date
1.

The amino acid with highest isoelcctric point is:

a)

Asparagine

b)

Histidine

c)

Lysine

d)

Arginine

2.

How many stereocentres are presents in " Glycyclalanylalanine" peptide

a)

1

b)

2

c)

3

d)

4

3.

The amino acids having a hydroxyl functional group are

a)

Serine, Threonine, and Tyrosine

b)

Serine, Valine, and Lysine

c)

Cysteine, Valine, and Lysine

d)

Threonine, Cysteine, and Valine

4.

The reagent used in the protein sequence analysis is

a)

van-Slyke reagent

b)

Sanger reagent

c)

Sorenson reagent

d)

Borsche's reagent

5.

which of the following amino acid liberates ammonia on mild hydrolysis and then yields a different amino acid

a)

Lysine

b)

Aspargine

c)

Tryptophan

d)

Alanine

6.

Lysisne has Pka1 = 2.18 and Pka2 = 8.9. the Pka of ionisation of side chain is 10.53 then isoelectic point of lysine is

a)

5.45

b)

7.12

c)

9.72

d)

6.35

7.

The corrrect aromaticity order is

a)

Thiophene > Benzene > Pyrrole > Furan

b)

Thiophene > Benzene > Furan > Pyrrole

c)

Benzene > Thiophene > Furan > Pyrrole

d)

Benzene > Thiophene > Pyrrole > Furan

8.

Thiophene reacts with HCHO and HCl to give

a)

b)

c)

d)

Both a and b

9.

Which of the follwoing is an essential aminoacid

a)

b)

c)

d)

All of the above

10.

Glycine reacts with excess formalin solution to form

a)

N- methylene glycine

b)

N - Methyl glycine

c)

hydroxy glycine

d)

Dimethylol gycine

11.

the correct order of relative reactivity towards electrophilic substitution reaction

a)

Benzene > Pyridine> Thiophene > Pyrrole > Furan >

b)

Benzene > Pyrrole > Furan > Thiophene > Benzene

c)

Pyrrole > Furan > Thiophene > Benzene > Pyridine

d)

Pyrrole > Thiophene > Furan > Pyridine > Benzene

12.

Why pyrrole boiling points are more than benzene and thiophene

a)

Intermolecular hydrogen bonding in pyrrole

b)

Intramolecular hydrogen bonding in pyrrole

c)

high molar mass of pyrrole

d)

none of the above

13.

The main product formed in the chichibabin reaction

a)

3 - amino pridine

b)

2 - amino pridine

c)

4 - amino pridine

d)

2, 3 - diamino pridine

14.

The sulphur containing aminoacid is

a)

Cysteine

b)

Methionine

c)

Cystine

d)

All of the above

15.

Proteins are the polymers of

a)

amino amides

b)

β - Amino acids

c)

α − \alpha\ -\ Aminoacids

d)

Amides

16.

The nature of pyrrole and amino acids are

a)

Amphoteric

b)

Acidic, Basic

c)

Basic, acidic

d)

Neutral

17.

Biuret test used for the detection of

a)

Saturated oils

b)

Proteins

c)

Carbohydrates

d)

Fats

18.

Which of the follwing has more resonance energy

a)

Pyridine

b)

Thiophene

c)

Benzene

d)

Pyrrole

19.

The aminoacid contains guanidine group

a)

Lysine

b)

Aspargine

c)

Arginine

d)

Imdidazole

20.

In the zwitterionic form of amino acid acts as

a)

A conductor of electricity

b)

Both proton donor and acceptor

c)

A proton donar

d)

A proton acceptor

21.

Pyridine has a delocalised molecular orbital containing

a)

4 electrons

b)

5 electrons

c)

6 electrons

d)

8 electrons

22.

Which of the following statement is wrong about glycine

a)

It contains a primary amine group

b)

it contains a COOH group

c)

its isoelectric point is 6.0

d)

it is optically active

23.

pyrrole is less basic than pyridine because the lone pair of electrons on Nitrogen atom

a)

resides in Pz orbital

b)

resides in SP2 hybrid orbital

c)

is not part of the delocalised molecular orbital

d)

is part of the delocalised molecular orbital

24.

which of the following statements is not true

a)

Benzene free from thiophene btained by shaking the mixture containg both by conc HNO3

b)

Pyrrole resembles aniline in reactivity

c)

Pyridine resembles nitrobenzene in reactivity towards electrophic substitution

d)

Furan is less aromatic thiophene

25.

The isoelectric point of alanine is 6.0 at pH 3 .00 it exists predominantly

a)

b)

c)

d)

26.

Identifiy the correct statement among the following

a)

Nitrogen is at negative end of the dipole in pyrrole

b)

Amination of pyridine takes place at 3rd position

c)

Pyrrole is a strong base

d)

Boiling point of Pyrrole is greater tha thiophene

27.

which of the following repregents the Strecker synthesis

a)

All

b)

1 and 2

c)

3 only

d)

3 and 4

28.

The correct statement among the following

a)

Pyridine and quinoline are a π - deficient heterocycle

b)

Pyrrole, furan and thiophene are a π - excess heterocycles

c)

π - excess heterocycles are susceptible towards electrophile attack

d)

All of the above

29.

the common prepartion method from which pyrrole, furan and thiophene are synthesise

a)

Hantzsch synthesis

b)

Knoor synthesis

c)

Paul - knorr synthesis

d)

paul - Hantzsch

30.

which of the following reagent will react with furan to form 2-furan sulphonic acid

a)

dil. H2SO4 at 100oC

b)

oleum

c)

SO2 at 100oC

d)

SO2 in pyridine at 100oC

31.

in Pyrrole electrophilic substitution takes place predominantly at

a)

at 2nd position

b)

at α - position

c)

at 3rd - position

d)

both a and b

32.

find out the product

a)

b)

c)

d)

All of the above

33.

Ala-Gly-Val-Ala-Leu, the number of peptide linkages are

a)

5

b)

3

c)

4

d)

2

34.

the major product formed in the reaction of 2,5 - hexanedione with P2O5

a)

b)

c)

d)

35.

The correct orientation of dipoles in pyrrole and pyridine is

a)

b)

c)

d)

36.

The correct order of pKa values of following compounds is

a)

I > II > III

b)

III > I > II

c)

III > II > I

d)

I > III > II

37.

C-C bond formation reactions are

a)

Riemer - Tiemann reaction

b)

Kolbe - Schmidt reaction

c)

Mannich reaction

d)

All of the above

38.

Pyrrole reacts with benzene diazonium chloride to form

a)

b)

c)

d)

39.

Which reagent is used for the nitration of furan?

a)

Conc. Nitric acid and sulphuric acid

b)

dil. Nitric acid and sulphuric acid

c)

Nitrobenzene

d)

Acetyl nitrate

40.

What is the product when thiophene reacts with Br2 in benzene?

a)

2-bromothiophene

b)

3-bromothiophene

c)

2,5-dibromothiophene

d)

3,4-dibromothiophene

41.

The decreasing order of the reactivity of the following compounds towards electrophiles is:


a)

I > II > III

b)

I > III > II

c)

III > II > I

d)

III > I > II

42.

Reduction of aminoacids with LiALH4 gives

a)

Alcohols

b)

Aminoalcohols

c)

Amines

d)

Amides

43.

The heterocyclic ring present in the aminoacid histidine is

a)

Imidazole

b)

indole

c)

phenol

d)

Tetrahydropyrrole

44.

δ - aminoacids on heating gives

a)

Cyclicdiamide

b)

α, β - unsaturated acid

c)

δ - valero lactam

d)

δ - Cyclicdiamide

45.

find out incorrect statement about Sangers's reagent

a)

it is used for the identification of aminoacids

b)

c)

it gives yellow colour with aminoacids

d)

none of the above

46.

Proteins are

a)

Composed of α - aminoacids

b)

All are optically active

c)

Amphoteric in nature

d)

All

47.

Find out the product

a)

b)

c)

d)

48.

The abnormal product formed in Riemer - Tieman reaction of pyrrole

a)

b)

c)

d)

49.

Methods used for the synthesis of aminoacids

a)

Gabriel phthalimide synthesis

b)

Strecker synthesis

c)

Erlenmeyer azlactone synthesis

d)

All of the above

50.

find out Incorrect statement

a)

Pyrrole reacts with Potassium to form pyrrolide anion

b)

pyrrolide anion is more aromatic than pyrrole

c)

pyrrole hydrochloride is non - aromatic

d)

None of the above

51.
a)

b)

c)

d)

52.

By passing acetylene gas and hydrogen cyanide through red hot tube gives

a)

Pyridine

b)

Pyrrole

c)

Indole

d)

Thiophene

53.

Furfural on heating with ZnO/Cr2O3 gives

a)

Furoic acid

b)

Furan

c)

Furoic anhydride

d)

All of the above

54.

B and A are

a)

b)

c)

d)

55.

Reagent used for this convesion and maleimide structure are

a)

b)

c)

d)

56.

The products A and B are

a)

b)

c)

d)

57.

Furan + PhLi ------> A + B

A + CO2 -----> C

B + CH3Cl ------> no reaction without catalyst Findout A, B and C

a)

A = 3- lithio furan, B = Benzene, C = 3 - Furoic acid

b)

A = 2- lithio furan, B = Benzene, C = 2 - Furoic acid

c)

A = Benzene, B = lithio furan, C = 2- Furoic acid

d)

both A and B

58.

The amino acids can participate in hydrogen bonding except one

a)

Threonine

b)

Serine

c)

Cysteine

d)

Valine

59.

Which base is present in RNA but not in DNA ?

a)

Gaunine

b)

Cytosine

c)

Uracil

d)

Thymine

60.

Glycine can be prepared from

a)

i) NH3 (excess), ii)H2O, iii) PBr3 , Br2

b)

i) NH3 (excess), ii) HBr iii)H2O,

c)

i) PBr3 , Br2, ii)H2O, iii) NH3 (excess)

d)

i) CH3NH3 (excess), ii) PBr3 , Br2 iii) H2O

61.

Find out the product P

a)

Methionine

b)

Serine

c)

Threonine

d)

Cysteine

62.

The correct statement about aminoacids

a)

soluble in water

b)

High melting points and dipolemoments

c)

Abscence of characteristic virabtional frequencies of Amino and COOH in IR spectral data

d)

All of the above

63.

Find out A

a)

Lactic acid

b)

Pyruvic acid

c)

Tartaric acid

d)

glyceraldehyde

64.

Which of the following amino acid contains secondary amine

a)

Proline

b)

Tryptophan

c)

Phenyl alanine

d)

Tyrosine

65.

on heating 3 - amino butanoic acid produces

a)

Crotonaldehyde

b)

Crotonic acid

c)

Crotonamide

d)

all of the above

66.

Benzo[b]pyridine is

a)

Quinoline

b)

Isoquinoline

c)

Indole

d)

tetrahydro isoquinoline

67.

Stability order od I, II and III is

a)

I > II > III

b)

II > III > I

c)

III > II > I

d)

I > III > II

68.

what is P

a)

N - Methyl pyrrole

b)

2 - Methyl pyrrol

c)

2,3 - dimethyl pyrrole

d)

2, 4 - dimethyl pyrrole

69.

when n - butane at 6000c reacts with sulfur in gas phase to form

a)

Thophene

b)

Thiol

c)

Furan

d)

Benzothiophene

70.

Furan reacts with Ni/H2 gas to form

a)

b)

c)

d)

71.

Thiophene present in commercial benzene as an impurity can be removed

a)

by shaking the mixture with oleum

b)

by shaking the mixture with hot con. H2SO4

c)

by shaking the mixture with cold con. H2SO4

d)

all of the above

72.

Structure of nicotinic acid is

a)

b)

c)

d)

73.

two moles of ethylacetoacetate + one mole of formaldehyde + one mole of ammonia undergoes condensation followed by oxidation to give

a)

b)

c)

d)

74.

in pyridine electrophilic and nucleophilc substitution reactions occurs at

a)

C -3, C -2

b)

C -2, C -3

c)

C -2, C -4

d)

C -3, C -4

75.

Pyridine reacts with mCPBA to give

a)

b)

c)

d)

76.

conversion of pyridine to piperidine

a)

LiAlH4

b)

Na/liq.NH3

c)

Na/C2H5OH

d)

HI/Red P

77.

Decreasing order of basicity of pyrrole, pyridine and aniline

a)

Pyridine > aniline > pyrrole

b)

aniline > Pyridine > pyrrole

c)

aniline > pyrrole > Pyridine

d)

Pyridine > pyrrole > aniline

78.

Father of Organic chemistry

a)

Jacob Berzelius

b)

Friedrich Wohler

c)

Kolbe

d)

Van't Hoff

79.

The Number of sp2- sp2 sigma bonds in pyridine

a)

6

b)

5

c)

4

d)

7

80.

Which of the following is non aromatic

a)

pyridine

b)

cyclopentadieny cation

c)

cyclopentadienyl anion

d)

pyrrole

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