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

Which of the following is not a biodegradable polymer.

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Protein

PVC

Cellulose

Nucleic acid

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

Recrystallization is the most common technique of purification of solid organic substances Which of the following statements is not related with characteristics of a suitable solvent.

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It dissolves the substance on heating

It readily allows it to separate out in the form of crystal on cooling

It does not react chemically with substance

It does dissolve the impurities.

Oxytocin, a pituitary hormone to

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Amino acid

Polypeptide

Protein

Conjugated protein

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

The bond length of C = C is

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1.20 A^o

1.34 A^o

1.54 A^o

1.68 A^o

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

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Recemic mixture

Meso isomer

Dextoroisomer

Levoisomer

Which of the following groups exert -1 effect.

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- NO2

- CN

-COOH

<C = 0

The binding site on ribosome t-RNA and m-RNA is provided by

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Polysome

Ribosomal RNA

Codone

DNA

Soft drinks and baby feeding bottles are generally made up

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Polyeater

Polyurethens

Polyamide

Polyetyrene

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.

The decomposition of dimethyl ether at 504 oC is first order with a half -life of 1570 second. What fraction of an initial amount of dimethyl ether remain after 47-10 seconds.

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1/3

1/6

1/8

1/16

The criteria for aromatically is presence of

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Uneaturations

Cyclic structure

Presence of 4nx electrons

Presence of 4n + 2n electrons

To complete transfer of a shared pir of electrons to one of the atoms joined by a double or triple bond at the requirement of an attacking reagent is known as.

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Inductive effect

Resonance effect

Eletromeric effect

Stark effect

Carbylamine reaction proceeds via the intermediate formation of.

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Alkyl isocyanide

Chloride ion

Alkyl carbonion

Dichloro methylene

Peppermint oil contains.

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Menthol

Thymol

a-pinene

Comphene

Enzymes are

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Complex non living compunds

Laving organisms

Complex protein molecules

Bacterial colonies

Carbon and Hydrogen are estimated by

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Liebig's method

Kjeldhal's method

Carries method

None of the above

Homolytic fission of convalent bond results in the formation of.

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Free redicals

Carbocations

Carbonions

Both B and C

Gutta percha is

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Cis poly imprene

Trans -polyisoprene

Polyethylene

Polyisobutylene

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