Question # 1

Which of the following reagent cannot be used to detect the phenolic group.

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Neutral FeCl3

I2/NaOH

NaOH solution

Br2/H2O

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

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Perfumes

Terphenoids

Flavonoids

Alkaloids

Identify an oxygenated cyclic terpenoid

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a- pinene

Camphor

Citral

Geranial

In which of the following group, each member given a positive iodoform test.

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Methanol, ethanol, propanone

Ethanol, isopropyl alcohol, methanol

Ethanol, ethanal, isopropyl alcohol

Propanal 2-propanol, propanone

Presence of nitrogen in organic compound to tested as.

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Nitrogen gas

NH3

NO

Amide

Which of the following statements not correct with the concept of Bronsted concept of acids and bases.

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An acid can donate a proton

A base can accept a proton

This concept has many bases that have OH- ions

This concept is more general

It is possible to distinguish between optical isomers.

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Using chemical tests

By mass spectrometry

By IR spectroscopy

By polarimetry

Homolytic fission of convalent bond results in the formation of.

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Free redicals

Carbocations

Carbonions

Both B and C

Glycerol on dehyeration gives

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Allyl alcohol

Aerolein

CHOH = C= CHOH

-CHO -CHOH -CH2OH

Co enzyme cna be separated from enzyme by

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Precipitation

Dalysis

Hydrolysis

Distillation

Treatment of phenol with cold dilute nitric acid gives.

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Only o-nitro phenol

Only p-nitro phenol

2,4,6 -Teinitro phenol

Mixture of o-and p-nitro phenol

Which of the following is an azo dye.

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Congo red

Rhodamine B

Ertythroein

Paraosaniline

Monomer of neoprene rubber to

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1-chloro 1,3- butadiene

2- chlro, 1,3-butadiene

2-Bromo -1,3- butadiene

2-Methyl 1,3-butadiene

When of the following steps is involved in structure determination of an organic compound.

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Purification of compund.

Qualitative and quantitative analysis of elements present

Determination of molar mass

All above steps

The isoelectric point of a protein or amino acid to.

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pH at which it does not have any charge

pH at which it does not have not charge and does not migrate in electric field

pH at which the concentration of cation is greater than amino

pH at which the concentration of anion is greater than cation

An impure sample of camphor contaminated with sand, can be purified by

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Distillation

Sublimation

Steam distillation

None of the above

All bond length in benzene are identical due to.

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Resonance effect

Inductomeric effect

Electromeric effect

Mesomeric effect

The reason why phenylamine is a much weaker base tahn ammonia when each is in aqueous solution to that.

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Teh ion pair of electron on two nitrogen atom of phenylamine is delocalised over the benzene ring.

The phenylamine molecule is too large to capture hydrogen ion easily

Phenylamine is much less soluble is water than is ammonia

The benzene ring has a tendency to increase the acidity of its substituents.

Toluene is o/p -orienting with respect to an electrophilic substitution reaction due to.

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+1 effect of the methyl group.

+1 as wellas +H effect of the methyl group

Hyper conjugatin between the methyl group and phenyl ring.

+ R effect of the methyl group

The product obtained on heating n-heptane with Cr2O3 ____Al2O3 at 600 ^oC is.

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Cycloheptane

Methyl cyclohexane

Benzene

Teluene

The study of coiled long peptide chains of protein to give a 3 dimensional structure is the study of.

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Primary structure

Secondary structure.

Tertiary structure

Quaternary structure.

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