Question # 1

What is the possible number of optical isomers for a compound contained 2 dissimilar asymmetric carbon atoms.

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2

4

6

8

Homolytic fission of convalent bond results in the formation of.

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Free redicals

Carbocations

Carbonions

Both B and C

Which statement is false.

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If a reaction is thermodynamically spontaneous it may occur rapidly

If a reaction is thermodynamically spontaneous it may occur slowly.

Activation energy is a kinetic quantity rather than a thermodynamic quantity.

If a reaction is thermodynamics spontaneous, it must have a low activation energy.

The denationalization involving C - H sigma bond electrons is known as .

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Conjugation

Hyperconjugation

Mesomerism

Resonance

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

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Polysome

Ribosomal RNA

Codone

DNA

Carbylamine reaction proceeds via the intermediate formation of.

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Alkyl isocyanide

Chloride ion

Alkyl carbonion

Dichloro methylene

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

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.

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

Chlorination of benzene with excess chlorine in the presence of FeCl3 as Lewis acid gives.

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Chlorobenzene as a major product

o-dichlorobenzene as major product

p-dichloro benzene as an only product

A mixture of 0- and p- dichloro benzene

Select an acidic amino acid

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Lysine

Cystine

Aspartic acid

Aminoacetic acid

Enzymatic action is heat at a fixed

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Temparature

pH

Both of these

None of these

A chromophore is an isolated fractional group which has

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Coloured appearance

Absorption in UV visible region

Only sigma bonds

Absorption in the region

An organic liquid (X) containing C, H and H has a pleasent odour with a boiling point of 78 oC. On boiling X with conc. H2SO4 a colourless gas is produced which decolourless bromine water and alkaline KMnO4 One mole of this gas also takes one mole of H2. The organic liquid (X) is.

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n-C3H7OH

iso-C3H7OH

C2H5CHO

CH3CH2OH

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

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

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Refplication

Translation

Transcription

Transference

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

a -amino acids when heated alone form

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Cyclic lactum

a-b-unsaturated acid

Fatty acids

Diketopiperzines

Various compound corresponding to molecular formula C1H10 are.

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Functional isomers

Position isomers

Chain isomers

None of the abvoe

Which of the following reagent cannot be used to detect the phenolic group.

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Neutral FeCl3

I2/NaOH

NaOH solution

Br2/H2O

Ingold's isoprence rule states that in terpenoids isopren units are joined.

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Head to tail

Head to head

Tail to tail

In a random order

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