Question # 1

The dye which is a constituent of Skiffs reagent used for detection formaldehyde group is.

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Gentain violet

Megneta

Phenolphthalein

Rosolic acid

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

Which of the following is not a characteristics of terponoids.

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They are pleasant smelling liquids

They are steam volatile

They are nitrogenous bases

They are insoluble in water

When propyne is treated with equeous H2SO4 in the presence of HgSO4 the functional isomer of the major product obtained in.

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Propanal

Acetone

Propane 2 -nl

Propanol

Which of the following statements is not correct. with respect to resonance.

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The position of atomic nuclei mus be same

The limiting structures must have same number of paired and unpaired electrons.

The energy of the various limiting structures must contribute equally

All above

Which of the following is strong adheaive.

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Epoxy resin

Melamine -formadehyde resin

Alkyd resins

Bakelite

The common host compound for the formation of inclusion compound is.

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Urea

Thiourea

Cholic acid

All above

Which of the following is most acidic.

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Phenol

p-nitrophenol

o-Nitrophenol

m-Nitrophenol

Which of the following statements is 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

Which statement is true.

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Resonance hybride are inherently unstable.

Resonance hybride are more static than any individual resonance form

Resonance hybride are average of all resoance forms resembling the more stabel forms

None of the above

Which of the following is branch chain polymer.

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Glycogen

Terylene

PVC

Orlen

The deficiency of which vitamin leads to beri brainteaser

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Thiamine

Riboflavin

Pyridoxine

Asorbic acid

The process of transfer of genetic message from DNA to m-RNA is known as

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Refplication

Translation

Transcription

Transference

Which of the following statement in not correct with respect to inductive effect.

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Bond length decrease with increase in inductive effect.

Inductive effect generates polar character in bonds

Variation in strength of aliphatic acids can be explained

It alone cna explain the basically of triphenylamine

Which of the following groups exert -1 effect.

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- NO2

- CN

-COOH

<C = 0

An example of acyclic monotterpenoid is

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a -pinene

Camphor

Geranial

Citral

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

a-terpioneol is obtained on hydration of which of the following with dilute H2SO4.

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Citral

Myrcene

Linalool

Limonene

Which of the following is not an androgen i.e. male sex hormones.

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Androsterone

Testosterone

Oestrone

All of these are make hormone

1-Butyne on oxymereuration -demercuration would give.

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Butanone

Butanal

Propanol and methanol

Propanoic acid and formic acid

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

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Perfumes

Terphenoids

Flavonoids

Alkaloids

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