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Alkaloids and Terpenes Quiz

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

Alkaloids are generally derived biosynthetically from which type of compounds?

a)

Carbohydrates

b)

Amino acids

c)

Lipids

d)

Steroids

2.

Which of the following is NOT a characteristic property of alkaloids?

a)

Bitter taste

b)

Basic in nature

c)

Form crystalline salts

d)

Highly soluble in water in free base form

3.

The term ‘alkaloid’ was coined by:

a)

Sertürner

b)

Meissner

c)

Pelletier and Caventou

d)

Robinson

4.

Alkaloids react with Mayer’s reagent to give:

a)

White precipitate

b)

Yellow precipitate

c)

Brown precipitate

d)

Blue colour

5.

Which reagent is commonly used for precipitation of alkaloids?

a)

Dragendorff’s reagent

b)

Benedict’s reagent

c)

Fehlings reagent

d)

Tollen’s reagent

6.

Hofmann exhaustive methylation is used for the structure elucidation of:

a)

Phenols

b)

Saturated amines

c)

Peptides

d)

Esters

7.

Hofmann degradation converts a quaternary ammonium hydroxide to:

a)

Isocyanate

b)

Alkene

c)

Ketone

d)

Alcohol

8.

The final product formed in Hofmann exhaustive methylation is:

a)

Amine

b)

Olefin

c)

Aldehyde

d)

Nitrile

9.

Coniine is an alkaloid isolated from:

a)

Tobacco

b)

Black pepper

c)

Poison hemlock

d)

Cinchona bark

10.

Coniine is:

a)

Aromatic alkaloid

b)

Heterocyclic alkaloid

c)

Aliphatic alkaloid

d)

Tropane alkaloid

11.

Coniine contains which functional group?

a)

Pyridine

b)

Piperidine

c)

Indole

d)

Quinoline

12.

Piperine is the pungent principle of:

a)

Piper nigrum

b)

Nicotiana tabacum

c)

Atropa belladonna

d)

Ephedra

13.

Piperine on hydrolysis yields:

a)

Piperidine + Piperic acid

b)

Coniine + Piperic acid

c)

Nicotine + Piperic acid

d)

Piperidine + Citral

14.

Nicotine is an alkaloid found in:

a)

Tobacco leaves

b)

Opium poppy

c)

Cinchona bark

d)

Belladonna

15.

Nicotine has how many heterocyclic rings?

a)

One

b)

Two

c)

Three

d)

Four

16.

Nicotine contains which two rings?

a)

Indole + Pyridine

b)

Piperidine + Pyridine

c)

Quinoline + Indole

d)

Pyrimidine + Pyrrole

17.

Alkaloids are mostly extracted by:

a)

Acid-base extraction

b)

Distillation

c)

Steam distillation

d)

Sublimation

18.

Alkaloids form soluble salts in:

a)

Basic medium

b)

Neutral medium

c)

Acidic medium

d)

Alcoholic medium

19.

The physiological action of Coniine is mainly:

a)

CNS stimulant

b)

CNS depressant / paralytic

c)

Analgesic

d)

Hallucinogenic

20.

Piperine belongs to which chemical class?

a)

Indole alkaloid

b)

Amide alkaloid

c)

Tropane alkaloid

d)

Glycoalkaloid

21.

Nicotine is chemically classified as:

a)

Pyridine–pyrrolidine alkaloid

b)

Quinoline alkaloid

c)

Isoquinoline alkaloid

d)

Tropane alkaloid

22.

Piperine gives which reaction due to the presence of conjugated double bonds?

a)

Bromine decolourisation

b)

FeCl₃ test

c)

Millon’s test

d)

Xanthoproteic test

23.

Alkaloids are usually stored in plants as:

a)

Free bases

b)

Salts

c)

Esters

d)

Glycosides

24.

Nicotine is liquid at room temperature because:

a)

It has low molecular weight

b)

It lacks aromatic ring

c)

It is a tertiary amine

d)

It contains two heterocycles

25.

Hofmann degradation helps in determining:

a)

No. of carbon atoms in chain

b)

No. of nitrogen atoms in molecule

c)

Position of functional group

d)

Aromaticity

26.

Terpenes are biosynthesized from:

a)

Acetyl-CoA

b)

Isoprene units

c)

Amino acids

d)

Sugars

27.

Basic building unit of terpenes:

a)

C₄ unit

b)

C₅ unit

c)

C₆ unit

d)

C₇ unit

28.

The isoprene rule was proposed by:

a)

Robinson

b)

Wallach

c)

Meissner

d)

Markownikoff

29.

Geraniol belongs to which class?

a)

Monoterpene alcohol

b)

Sesquiterpene

c)

Diterpene

d)

Triterpene

30.

Citral is a mixture of:

a)

Alpha and beta citronellal

b)

Geranial and neral

c)

Menthol and menthone

d)

Camphene + Limonene

31.

Citral is a:

a)

Terpene alcohol

b)

Terpene ketone

c)

Terpene aldehyde

d)

Terpene acid

32.

α-Terpineol contains which functional group?

a)

Aldehyde

b)

Alcohol

c)

Ketone

d)

Ether

33.

Menthol is:

a)

Cyclic monoterpene alcohol

b)

Acyclic monoterpene alcohol

c)

Sesquiterpene aldehyde

d)

Tetraterpene hydrocarbon

34.

Camphor is chemically a:

a)

Ketone

b)

Alcohol

c)

Aldehyde

d)

Acid

35.

Camphor belongs to which class?

a)

Bicyclic monoterpene

b)

Acyclic monoterpene

c)

Diterpene

d)

Sesquiterpene

36.

Which terpene gives characteristic peppermint odour?

a)

Menthol

b)

Citral

c)

Geraniol

d)

Camphor

37.

Geraniol on oxidation gives:

a)

Citral

b)

Camphor

c)

Menthone

d)

Piperonal

38.

Which test confirms the presence of aldehyde group in citral?

a)

Tollen’s test

b)

Millon’s test

c)

FeCl₃ test

d)

Ninhydrin test

39.

Isolation of essential oils rich in terpenes is generally done by:

a)

Steam distillation

b)

Solvent extraction

c)

Chromatography

d)

Acid–base extraction

40.

Which terpene contains a bicyclic structure?

a)

Camphor

b)

Geraniol

c)

Citral

d)

Menthol

41.

The odour of rose oil is due to:

a)

Menthol

b)

Geraniol

c)

Citral

d)

Camphor

42.

α-Terpineol is obtained commercially from:

a)

Camphor

b)

Pine oil

c)

Rose oil

d)

Orange peel

43.

Citral reacts with Schiff’s reagent to give:

a)

Red colour

b)

Yellow precipitate

c)

Purple colour

d)

Brown colour

44.

Menthol can be converted to menthone by:

a)

Reduction

b)

Oxidation

c)

Hydrolysis

d)

Dehydration

45.

Camphor is reduced to:

a)

Borneol

b)

Menthol

c)

Citral

d)

Geraniol

46.

Which terpene has the formula C₁₀H₁₈O?

a)

Camphor

b)

Citral

c)

Geraniol

d)

Piperine

47.

Which is an acyclic monoterpene?

a)

Citral

b)

Camphor

c)

Menthol

d)

Terpineol

48.

The characteristic lemon odour in lemon oil is due to:

a)

Citral

b)

Geraniol

c)

Menthol

d)

Camphor

49.

Camphor can be detected by:

a)

2,4-DNP test

b)

Tollen’s reagent

c)

Schiff’s reagent

d)

Benedict’s reagent

50.

50. The structure elucidation of terpenes is generally done using:

a)

a) Ozonolysis

b)

B) Nitration

c)

C) Sulfonation

d)

D) Diazotization

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