Question # 1

Organic substance responsible for the smell of the Flowers etc are grouped together in chemistry as.

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Perfumes

Terphenoids

Flavonoids

Alkaloids

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

The number of hydrogen bonds boding A _____ T pair is

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1

2

3

4

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 bond length of C = C is

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1.20 A^o

1.34 A^o

1.54 A^o

1.68 A^o

The vitamin which is related to monossaccharides is.

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Vitamin A

Vitamin C

Vitamin D

Vitamin E

Which of the following is the major process when neopentyl bromide is dehydrogenate with alcoholic potash.

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2- methyl -1- butene

2- methyl- 1- butene

2,3 -dimethyl butene

2- butene

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

When FeSO4 is added in the sodium extract the compound formed is.

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Only Na4[Fe (CN)6]

Only Fe (OH)2

Only Na2So4

Mixture of all these

When the concentration of reactant molecules is increased the rate of reaction increases. The best explanation is As the reactant concentration increases.

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The average kinetic energy of molecules increases.

The frequency of molecular collisions increases

The rate constant increase

The activation energy increases

In the presence of dilute alkali monosaccharides undergo reversible isomerisation . The reaction known as.

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Kiliani reaction

Weermann rearrrangement

Lobry do Bruyn Van Ekenstein rearrangement

Mutarotation

Among the following a good solvent for a Grignard reagent formation would be.

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t- butanol

dimethyl ether

difiuoro ethane

tetrahyudroform

Which of the following is not a naturally occurring dye.

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Indogo

Indigotin

Alizarin

Malachite green

Which of the following statements is not correct with respect to applications of H- bonding.

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It explains the usual b.p. and m.p of certain class of compound.

It explains the solubility of certain organic compounds in hydroxylic solvents

It explains the lack of ideal behavior in gases and solutions

It has stonrg influence on the configuration of certain molecules.

Ingold's isoprene rule states that in tepenoids isoprene units are joined.

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Head to tail

Head to Head

Tail to Tail

In a random order

Which of the following techniques is involved in purification of organic compound.

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Distillation

Sublimation

Solvent extraction

All above

The study of coiled long peptide chains of protein to give a 3 dimensional structure is the study of.

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Primary structure

Secondary structure.

Tertiary structure

Quaternary structure.

Which of the following effects best explains that o-nitro phenol is insoluble in water.

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Inductive effect

Resonance effect

Intramolecular H -bonding

Isomeric effect

RNA is involved int eh synthesis of

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Protein

Nucleic acid

Carbohydrates

Fats

According to R, S system the correct order of priority of the following groups is .

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-CH2OH > - CHO > ----- COOH

-COOH > ------CHO > ------CH2OH

---- CH2OH -----> - COOH > -------CHO

--- COOH > - CH2OH >----- CHO

Polyamide jinkage is present in

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Nylon

Silk

Protein

All of these

More Classes

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PPSC Chemistry Part II Organic Chemistry Online Test MCQs With Answers

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