Question # 1

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

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Inductive effect

Romance effect

Hydrogen effect

All above

Hydrogen bons holding the strand to nucleic acids are formed between

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Sugar and base units

Base unit

Sugar ane phosphate units

Sugar units

Which of the following alkyl halide undergoes nucleophilic substitution reaction via the formation of a carboncation.

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1-chloro -2 methyl propane

2- chlro-2-methyl propane

2- chloro butane

1-Chloro, 3,3- dimethyl pentane

Which of the following statement in not correct with respect to inductive effect.

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Bond length decrease with increase in inductive effect.

Inductive effect generates polar character in bonds

Variation in strength of aliphatic acids can be explained

It alone cna explain the basically of triphenylamine

Which of the following is branch chain polymer.

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Glycogen

Terylene

PVC

Orlen

The dye which is a constituent of Skiffs reagent used for detection formaldehyde group is.

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Gentain violet

Megneta

Phenolphthalein

Rosolic acid

Dyes used in photographic plates to make them panchromatic is.

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Cyanine dyes

Azine dyes

Phthalocyanine dyes

Acridine dyes

Phosphorus is detected by fusing the organic compound with -------followed by extraction with H2O

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HNO3

H2SO4

Sodium per oxide

Ozone

Orion is polymer of.

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Styrene

CF2 = CF2

Vinyl chloride

Acrylontrile

Select an acidic amino acid

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Lysine

Cystine

Aspartic acid

Aminoacetic acid

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

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

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Ethanal

Ethanoic acid

Ethanol

Ethync

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

Process of separating the racemic mixture into optically active isomers is known as.

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Resolution

Racemisation

Walden inversion

Epimerization

Monomer of natural rubber is

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1,3-Butadiene

2-Methyl -1,3-butadiene

1,2 -Butadiene

1,3 - Pentadiene

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

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 capable of shown g optical isomersm.

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CH3COCOOH

CH3CHOHCOOH

Botha a and b

All of these

The IUPAC name of ethylene oxide is.

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Epoxy methane

Oxcethene

Methoxymethane

All of the above

a- pinene hydrochloride on warming rdarranges to form bornyl chloride.The rearrangement is known as.

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Pinacol pinacolone

Hofinann

Wager Mecrwein

Wolff

Alkyl cyanide and alkyl isocyanides are

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Tautomers

Metamers

Functional isomers

None of the above

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