Question # 1

Dry distillation of amino acids with barium hydroxide yields.

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Acids

Amines

Alcohols

Hydroxy acids

When the concentration of reactant molecules is increased the rate of reaction increases. The best explanation is As the reactant concentration increases.

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The average kinetic energy of molecules increases.

The frequency of molecular collisions increases

The rate constant increase

The activation energy increases

The terpenoid present in oil of lemon grass is

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Citral

Geranial

Nerol

a- terpineol

What is the activation energy of a reaction whose rate constant increases by a factor of 100 upon increasing the temperature from 300 K to 360 K.

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27

35

42

69

The most suitable method of separation in mixture of o-and p- nitrophenol is.

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Steam distillation

Chromatography

Ion-exchange

Sublimation

Sterols are steroids having the functional gruup.

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Ketonic

Al;coholic

Phenolic

Aldehydic

Coagulation of protein on treatment with heavy motal salts or heating is called.

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Decolorisation

Denaturation

^{Sedimentation process}

Reversible precipitation

A mordants is substance which in

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Coloured

Leuco -base of a dye

Fixes dye on the fabric

All of these

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 of the following type of polymerization is used for the preparation of synthetic rubber.

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Free radical

Zingler natta

Cationic

Anionic

Bromination of n-butane produces.

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I-bromobutane as the major product

2- bromobutane as the major product

Both I - bromo and 2- bromobutane with equal percentage

Both i-bromo and 2-bromo products whose percentage depends upon temperature.

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

Ziegler -Natta catalysta is

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(C2H3)3 Al

TiCl4

(C2H5)3 Al/TiCl4

(C2H3)3 B/TiCl2

Select the major product obtained from the addition HBr to 1-methyl cyclohexene.

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1- bromo -2- methyl cyclohexane

6- bromo-1- methyl cyclohex - 1- ene

3- bromo-1- methyl cyclohex -1- ene

1- bromo-1- methyl cyclohexane

All steroids on heating wish solenium give

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phenanthrene

Cholesterol

Diels hydrocarbon

Isoprene

Which of the following statement is not correct with respect to limitations of Hammett equation.

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It is only applicable to aromatic systems

Only applicable to aliphatic systems

It is not valid for m-substituent

Which of the following statements regarding phenols is not correct.

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Phenol ls are stronger acids than water and alcohols.

Phenol are weaker acids than carboxylic acids

Phenol are solubel in both aqueous NaOH and aqueous sodium hydrogen carbonate

Phenoxides ions are more stable than the corresponding phenol

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

Sugar and common salt in a mixture can be separated through then process of.

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Sublimation

Distillation

Ion exchange

Crystallization from solution in ethanol

Which of the following linear polymer.

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Polypeptide

Protein

Starch

Phenol formaldehyde resin

Which of the following property has a higher value for trans isomer as compared to cis isomer.

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Density

Dipole moment

Melting point

Boiling point

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