Question # 1

Organic substance responsible for the smell of the Flowers etc are grouped together in chemistry as.

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Perfumes

Terphenoids

Flavonoids

Alkaloids

What type of inter molecular force present in nylon-66^o

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Vander wall

Hydrogen bond

Dipole -dipole interactions

Sulphide linkage

Soft drinks and baby feeding bottles are generally made up

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Polyeater

Polyurethens

Polyamide

Polyetyrene

One arm of each t-RNA terminates in the base sequence.

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UGU

GGC

ACT

CCA

Which of the following effects best explains that o-nitro phenol is insoluble in water.

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Inductive effect

Resonance effect

Intramolecular H -bonding

Isomeric effect

Select an acidic amino acid

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Lysine

Cystine

Aspartic acid

Aminoacetic acid

Enfleurage process is used to extract the essential oils from

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Back of plant

Seeds of plant

Leaves of plant

Flowers of plant

a-pinene hydrochloride on warming rearrangements to form bornyl chloride

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Pinacol pinacolone

hofmann

Wagner Meerwein

Wolf

Ingold's isoprence rule states that in terpenoids isopren units are joined.

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Head to tail

Head to head

Tail to tail

In a random order

Which of the following is not a pyrimidine base.

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Uracil

Thymine

Cytosine

Guanine

The light absorbed in UV and visible region causes.

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Vibrational energy changes

Rotational energy changes

Electronic excitation

All of these

C is -2 butene on reaction with bromino give 2,3 -dibromobutane which is

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Recemic mixture

Meso isomer

Dextoroisomer

Levoisomer

Indigotin is a dye obtained from indigo plant which belongs to the group of.

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Substantive dyes

Mordant dyes

Vat dyes

Disperse dyes

Among the following statements in the nitration of aromatic compounds, the false one is.

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The rate of nitration of benzene is almost the same as that of hexadeutero benzene

The rate of nitration of toluene is greater than that of benzene

The rate of nitrationof benzen is greater than that of hexadeutero benzene.

Nitration in an electrophite substitution reaction.

Plane polarized light is affected by

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Identical molecules

All polymers

Chiral molecules

All biomolecules

A mordants is substance which in

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Coloured

Leuco -base of a dye

Fixes dye on the fabric

All of these

Amino acids have

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Acidic group

Basic group

Both of these

None of these

The reduction of an alkyne to alkene using Lindlar's catalyst results into

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Syn addition of hydrogen atoms

Anti addition of hydrogen atoms

A mixture obtained by ayn and anti addition of hydrogen which are equilibrium with each other

A mixture obtained by syn and anti addition of hydrogen which are not in equilibrium with each other.

SAN is a polymer of

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Styrene

Acrylonitrile

Both A and B

Vinyl chloride

Oxytocin, a pituitary hormone to

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Amino acid

Polypeptide

Protein

Conjugated protein

Identify an oxygenated cyclic terpenoid

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a- pinene

Camphor

Citral

Geranial

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