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Worksheetsمنتجات طبيعيه
Total questions: 15
Worksheet time: 8mins
- The general formula of alkenes corresponds to the general formula of which terpenoid of the following
acyclic
bicyclic
tricyclic
monocyclic
A 1-1 link between two isoprene units is termed as…………………………………… linkage
Head-to-Head
b) Tail-to-Tail
c) Head-to-tail
d) None of these
3- In SEC secondary metabolites are separated based on their……………………….
frictional force
molecular weights
electrical charge
size-to-charge ration
An oxidizing agent will convert menthol into which of the following
pulegone
b) 3-menthone
c) 3-menthene
p-cymene
vigorous oxidation of the product obtained from the effect of KOH on Eugenol will afford……………….
Eugenol
isoeugenol
Gauiacol
Vanillic acid
6-All 1H-NMR signals (excluding OHs) appear for kaempferol corresponds to ……………………... protons
three
b) six
c) five
d) two
The chemical shift of the anomeric proton of glucose appears in which range of the following
2-3
b) 5-6
c) 3-4
d) 6-7
8-The 1H-NMR signals of proton in position 6’ in quercetin will have which of the following shape
doublet
b) singlet
c) triplet
d) pair of doublets
Tetrodotoxin is considered as …………………………………….
Polypeptide toxin
b) Nonpeptide toxin
c) Artificial toxin
d) semi-natural toxin
Epibatidine is a potent ……………………... extracted from the skin of some frogs
Antibiotic Peptide
b) poison
c) Analgesic
d) anti-cancer
11-excess potassium permanganate will cause the conversion of menthone into which of the following
ketoacid
b) dicarboxylic acid
c) ketone
d) p-cymene
12- The mass spectra of terpenes are used for determining its………………………
M.wt and number of protons
b) functional groups
c) conjugation
d) M.wt and positions of double bonds
………………………. is obtained from the ozonolysis of citral
p-cymene
b) methyl adipic acid
c) Laevulaldehyde
d) acetophenone
14-the effect of potassium carbonate on citral will afford which of the following
6-methyl hept-5-ene-3-one
b) 5-methyl hept-5-ene-2-one
c) 5-methyl hept-6-ene-2-one
d) 6-methyl 5-heptene-2-one
The major constituents extracted from the skin of the African clawed frog are………………………
Flavonoids
b) Terpenes
c) Alkaloids
d) Antibiotics
