Question # 1

Each of the following compound react with Grignard's reagent to form alkane exxcept.

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Ethanal

Ethanoic acid

Ethanol

Ethync

In order to give strength and elasticity natural rubber is heated with.

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Sulphur

Oxygen

Nitrogen

Chlorine

Which type of polymer the Nylon -06 is

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Polyamide

Polyester

Addition

Homopolymer

Which of the following case of acid or base strength is not explained by inductive effect.

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Formic acid> acetic acid

Dimethyl amine > trimethyl amine

Dimethyl amine > methyl amine

Chloroacetic acid > acetic acid

Estimation of nitrogen in proteins is generally arrived out by the method.

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Duma's method

Van Slyke method

Kjeldahl's method

Carius method

In the presence of dilute alkali monosaccharides undergo reversible isomerisation . The reaction known as.

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Kiliani reaction

Weermann rearrrangement

Lobry do Bruyn Van Ekenstein rearrangement

Mutarotation

RNA is involved int eh synthesis of

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Protein

Nucleic acid

Carbohydrates

Fats

Which of the following is not a naturally occurring dye.

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Indogo

Indigotin

Alizarin

Malachite green

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

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Distillation

Sublimation

Steam distillation

None of the above

Essential oils are purified by which of the following methods.

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Steam distillation

Sublimation

Crystallization

Fractional crystallization

Which of the following compounds would you use in order to obtain a crystalline derivative of an aromatic amine.

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2,4 Dinitrophenyl hydrazine

Nitrous acid

Benzoyl chlride

None of these

Which configuration has lowest potential energy.

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Eclipsed

Staggered

Skew

All have same energy

Which of the following dye is used an antiseptic .

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Methyl orange

Mercurochrome

Alizarin

Bismarck brown

Compounds HCN and HNC are.

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Tautomers

Metamers

Functional isomers

Conformers

Which of the following is not a general property of amino acids.

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They have high m.p. and b.p

They are soluble in water

Their dipole moments are high

They are amorphous solids

A terpenoid which as an alcoholic group in the molecule is

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Citral

Camphor

Menthol

Carvone

Which of the following contains isoprene unite.

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Natural rubber

Nylong -6,6

Polyethylene

Decron

A correct reaction mechanism for a given reaction usually is.

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The same as the balanced chemical equation

Obvious if its heat of reaction is known

Sometimes difficult to prove

Obvious if the activation energy is known

Which of the following is not a biodegradable polymer.

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Protein

PVC

Cellulose

Nucleic acid

Biogical role of nucleic acid doe snot include

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Genetic continuity

Protein syathesis

Hybridization

Mutation

Which of the following does not have an a,b, unsaturated carbonyl group.

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Androsterone

Oestrone

Testosterone

Progesterone

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