Question # 1

Which type of polymers the Vulcanised rubbers is.

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Linear

Cross jinked

Branch chain

Any one of these

Select a basic amino acid.

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Glycine

Cystine

Alanine

Lysine

Carbylamine reaction proceeds via the intermediate formation of.

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Alkyl isocyanide

Chloride ion

Alkyl carbonion

Dichloro methylene

Arrangement of peptide chains of protein in spec to form helix stucture is referred to as.

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Primary structure

Secondary structure

Tertiary structure

Quaternary structure

A terpenoid which as an alcoholic group in the molecule is

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Citral

Camphor

Menthol

Carvone

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

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HNO3

H2SO4

Sodium per oxide

Ozone

a-pinene hydrochloride on warming rearrangements to form bornyl chloride

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Pinacol pinacolone

hofmann

Wagner Meerwein

Wolf

The compound (CH3)3COH according to IUPAC is known as.

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Tert Butanol

2,2 -Dumethyl -Propanol

2- Methyl -2-propanol

Tert Alcohol

Which one of the following woul dmake an S_N2 mechanism more likely

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Bulky substituents near the halogen

A polar solvent

A tertiary carbocation intermediate

A reactive nucleophile

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

Enfleurage process is ued to extract the essential oils from

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Bark of plant

Seeds of plant

Leaves of plant

Flowers of plant

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.

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 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

Urea an enzyme used to estimate urea is a

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Hydrolytic enzyme

Oxidative enzyme

Reductive enzyme

Iso me rising enzyme

The reduction of an alkyne to alkene using Lindlar's catalyst results into

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Syn addition of hydrogen atoms

Anti addition of hydrogen atoms

A mixture obtained by ayn and anti addition of hydrogen which are equilibrium with each other

A mixture obtained by syn and anti addition of hydrogen which are not in equilibrium with each other.

The light absorbed in UV and visible region causes.

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Vibrational energy changes

Rotational energy changes

Electronic excitation

All of these

Suppose the activatin energy of a certain reaction is 250 kj/mol, If the rate constant at T1 =300 K is k1 and the rate constant at T2= 320 K is ks, then the reaction is ______ times faster at 320 K than at 300 K

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3 x 10^-29

0.067

525

15.0

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

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

All bond length in benzene are identical due to.

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Resonance effect

Inductomeric effect

Electromeric effect

Mesomeric effect

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