Question # 1

Indigotin is a dye obtained from indigo plant which belongs to the group of.

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Substantive dyes

Mordant dyes

Vat dyes

Disperse dyes

The number of hydrogen bond present in G -C pair is

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1

2

4

3

The terpenoid present in oil of lemon grass is

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Citral

Geranial

Nerol

a- terpineol

Rectified spirit obtained by formentation contains 5% of water .So in order to remove it, rectified spirit is mixed with suitable quantity of benzene and heated Benzene helps because.

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It is dehydreating agent and so removes water

It forms the loweer layer which retains all the water so that alcohol can be distilled off

It form an azeotropic mixture having high boiling point and thus allows the alcohol to distall over

It forms low boiling azeotropic mixture which distille over leaving behind pure alcohol which can than be distilled.

Ziegler -Natta catalysta is

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(C2H3)3 Al

TiCl4

(C2H5)3 Al/TiCl4

(C2H3)3 B/TiCl2

The number of hydrogen bonds boding A _____ T pair is

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1

2

3

4

The IUPAC name of HOCCH2CH2CH2COOH is

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4- formylbutanoic acid

5- formylpentanoic acid

4- carboxybutanal

5- carboxypentanal

The terpenoid responsible fo the smell

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Camphor

Genenial

Citral

Carvone

Identify the incorrect statement regarding crystallization from the following.

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It is an important procedure for purifying solids

The impurities are removed by filtering the solution

Crystals are separated by filtration

In crystallization method, the solid is dissolved in a solvvent in which it is soluble at all temperature.

How many stereoisomers are possible for CH3CH = CHCHCH(Br) CH3

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2- geometrical isomers

2- optical isomers

2- geometricla nad 2- optical isomers

2- geometrical and 1 optical isomers

Plane polarized light is affected by

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Identical molecules

All polymers

Chiral molecules

All biomolecules

Which of the following statements is not correct with respect to applications of Hammett equations.

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It develops a quantitative relationship between structure and reactivity

This equation on can be used to calculate the value of pK_a

This equation does not help to calculate the rate of some reactions

This equation has mechanistic implications

Which of the following class of compounds follow the criteria of aromatically.

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The compounds must have high degree of unsaturation

they must have the property to undergo addition reactions

They must have the property to undergo substitution reactions

They must have the ability to sustain an induced current in NMR

Compounds consisting of two or more interlocked rings are called.

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Inclusion compounds

Cage compounds

Catenanes

Crown other

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

Cytosine a pyrimidine base pairs with

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Guanine

Thymine

Adenine

Any of these

Which of the following factors effect the strengths of acids and bases.

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Inductive effect

Romance effect

Hydrogen effect

All above

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

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Cycloheptane

Methyl cyclohexane

Benzene

Teluene

Which of the following products is obtained when but 2-ene is treated with perchloric acid.

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CH3CHO only

CH3COOH only

CH3CHO and CH3COOH

CH3CH2COOH + HCOOH

Which of the following statement is false about resonance.

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It increase the stability of a molecule

It leads to similar type of bonds

It increase the reactivity of the molecule

It decrease the reactivity of the molecule.

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