Question # 1

Which of the following group will have hyper conjugation effect when attached to benzene.

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------ CH3

----C6H5

------C(CH3)3

---------CH(CH3)2

Which of the following a -amino acid is not capable of exhibiting optical isomerism.

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Glycine

Leucine

Arginine

Alanine

Which of the following contains isoprene unite.

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Natural rubber

Nylong -6,6

Polyethylene

Decron

Urea an enzyme used to estimate urea is a

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Hydrolytic enzyme

Oxidative enzyme

Reductive enzyme

Iso me rising enzyme

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 catalyst

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Actually participates in the reaction

Changes the equilibrium concentration of the products

Does not affect a reaction energy path

Always decreases the rate for a reaction

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

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1

2

4

3

Primary structure of protein refers to

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Amino acid sequence

Arrangement of peptide chains

Orientation of amino acids

Whether is has a or b helix in space structure.

Enzymes are

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Complex non living compunds

Laving organisms

Complex protein molecules

Bacterial colonies

The unit of nucleic acid having base sugar combination is called.

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Nucliec acid

Nucleoside

Nucleotide

None of these

When propyne is treated with equeous H2SO4 in the presence of HgSO4 the functional isomer of the major product obtained in.

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Propanal

Acetone

Propane 2 -nl

Propanol

The IUPAC name of ethylene oxide is.

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Epoxy methane

Oxcethene

Methoxymethane

All of the above

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

Which of the following is branch chain polymer.

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Glycogen

Terylene

PVC

Orlen

Which of the following is not a pyrimidine base.

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Uracil

Thymine

Cytosine

Guanine

Which of the following statements is not correct. with respect to resonance.

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The position of atomic nuclei mus be same

The limiting structures must have same number of paired and unpaired electrons.

The energy of the various limiting structures must contribute equally

All above

Which of the following statements are correct for Linear polymers.

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Linear polymers may be condensation as well as addition polymers

Structure is well packed in nature

Linear polymers have higher density higher melting point and higher tensile strength

All are correct

Which of the following pairs does not represent Lowery acid base pair.

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H2O+NH3

H2O +H2O

HCL + H2O

CH3NH2 + BF3

The sugar present in DNA is

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D- Ribose

D-Glucose

2- Doxy D-Ribose

3-Deoxy D-ribose

Which of the following test is not shown by proteins.

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Xanthoproten test

Ninhydrin test

Hopkin cole test

Muliken Barker test

Citral when heated with KHSO4 forms.

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Isoprene

p-cymene

p-menthane

Dipentene

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