Biology/Biology MCQ Question - Alkyl Halides Sample Test,Sample questions

Question:
50% inversion of configuration of molecules take place in a

1.E1 - reaction

2.E2 - reaction

3.SN1 - reaction

4.SN2 - reaction


Question:
Acidic amino acids have

1.2 amino groups and 1 carboxylic group

2.1 amino and 1 carboxylic groups

3.2 carboxylic groups and 1 amino group

4.2 amino and 2 carboxylic groups


Question:
Alkyl halides are considered to be very reactive compounds towards nucleophile because

1.they have an electrophilic carbon

2.they have an electrophilic carbon & a good leaving group

3.they have an electrophilic carbon & a bad leaving group

4.they have a nucleophilic carbon & a good leaving group


Question:
Alkyl halides undergo a type of reaction

1.Nucleophilic substitution

2.Nucleophilic addition

3.Elimination

4.both a & c


Question:
C5H12 has the number of isomers

1.one

2.two

3.three

4.four


Question:
Carboxylic acid reacts with ammonia to form ammonium salts which on heating produces

1.CO2

2.Alkane

3.Ester

4.Acidamide


Question:
During SN2 mechanism carbon atom changes its state of hybridization as

1.sp?sp2

2.sp2?sp3

3.sp3?sp

4.sp3?sp2


Question:
Elimination bimolecular reactions involve

1.first order kinetics

2.second order kinetics

3.third order kinetics

4.zero order kinetics


Question:
Ethyl chloride with nascent hydrogen produces

1.methane

2.ethane

3.propane

4.butane


Question:
Ethylene epoxide treated with Grignards reagent followed by acid hydrolysis yield

1.primary alcohol

2.secondary alcohol

3.tertiary alcohol

4.dihydric alcohol


Question:
For which mechanisms the first step involved is the same?

1.E1 + E2

2.E2 + SN2

3.E1 and SN1

4.SN1 and SN2


Question:
Glycine is the name of an amino acid because

1.Sweet taste

2.Bitter taste

3.Shining appearance

4.Green colour


Question:
Grignard reagent is reactive due to

1.the presence of halogen atom

2.the presence of magnesium atom

3.the polarity of C-Mg bond

4.all


Question:
In elimination reactions of alkyl halide which site is more susceptible for the attack of base

1.? - carbon

2.? - carbon

3.? - hydrogen

4.? - hydrogen


Question:
In primary alkyl halides the halogen atom is attached to a carbon which is further attached to how many carbon atoms

1.two

2.three

3.one

4.four


Question:
In the formation of Zwitter ions proton goes from

1.Carboxyl to amino group

2.Amino to carboxyl group

3.Amino group only

4.Carboxyl group only


Question:
SN2 reaction can be best carried out with

1.primary alkyl halide

2.secondary alkyl halide

3.tertiary alkyl halide

4.all


Question:
The acid which is used as ink remover is

1.Oxalic acid

2.Succinic acid

3.Adipic acid

4.Acetic acid


Question:
The best method of preparation of alkyl halides is a reaction of alcohol with

1.Zn / HCI

2.SOCl2 / Pyridine

3.PCI3

4.PCI5


Question:
The common name of propane 1 3-dioic is

1.Oxalic acid

2.Aromatic acid

3.Malonic acid

4.Fumaric acid


Question:
The common thing in phthalic acid and oxalic acid is that both are

1.Aromatic

2.Dicarboxylic

3.Hydrocarbons

4.Strong acids


Question:
The ether used in Wurtz synthesis is

1.acidic

2.basic

3.aqueous

4.dry


Question:
the fractional distillation of petroleum produces gasoline up to

1.10%

2.15%

3.20%

4.30%


Question:
The general formula of cycloalkene is

1.CnH2n

2.CnH2n+2

3.CnH2n-1

4.CnH2n-2


Question:
The irritation caused by red ants bite is due to

1.Lactic acid

2.Formic acid

3.Uric acid

4.Acetic acid


Question:
The number of molecules taking part in the rate determining step is called

1.Order of reaction

2.Rate of reaction

3.Mole of a reaction

4.Extent of a reaction


Question:
The organic acid that does not has COOH group is

1.phthalic acid

2.carbolic acid

3.Maleic acid

4.Succinic acid


Question:
The rate of E1 reaction depends upon

1.the concentration of substrate

2.the concentration of nucleophile

3.the concentration of substrate as well as nucleophile

4.base the concentration of substrate as well as nucleophile


Question:
The term internal salt refers to

1.Acidic character of amino acids

2.Basic character of amino acids

3.Dipolar character of amino acids

4.Non-polar structure of amino acids


Question:
The test which is used for the identification of amino-acids is

1.Ninhydrin test

2.Molisch test

3.Biuretic test

4.Benedict test


Question:
What is the order of kinetics in the SN1 mechanism?

1.Zero

2.First

3.Second

4.Third


Question:
What will be the order of reaction of a reaction whose rate can be expressed as R = K [A] [B]?

1.Zero

2.One

3.Two

4.Three


Question:
What will be the products when reactants are alcohol & thionyl chloride in the presence of pyridine?

1.RC?+S+HC?

2.RC?+SO2+HC?

3.RC?+SO2+H2O

4.RC?+S+H2O


Question:
When - COOH is attached directly to the benzene ring the acid is called

1.Aliphatic

2.Alicyclic

3.Carboxylic

4.Aromatic


Question:
When CO2 is made to react with ethyl magnesium iodide followed by acid hydrolysis the product formed is

1.propane

2.propanoic acid

3.propanal

4.propanol


Question:
When two moles of ethyl chloride react with two moles of sodium in the presence of ether what will be formed?

1.2 moles of ethane

2.1 mole of ethane

3.2 moles of butane

4.1 mole of butane


Question:
Which acid is the manufacture of synthetic rubber?

1.Acetic acid

2.Formic acid

3.Carbonic acid

4.Benzoic acid


Question:
Which alkyl halide has the highest reactivity for a particular alkyl group?

1.R-F

2.R-C?

3.R-Br

4.R-I


Question:
Which alkyl halide out of the following may follow both SN1 and SN2 mechanism?

1.CH3-X

2.(CH3)3 C-CH2 - X

3.(CH3)2 CH - X

4.(CH3)3 C - X


Question:
Which C-X bond has the highest bond energy per mole?

1.C-F

2.C-C?

3.C-Br

4.C-I


Question:
Which is not heterocyclic compound

1.Furan

2.Thiophene

3.Aniline

4.Pyridine


Question:
Which of the following is the strongest acid?

1.Water

2.Formic acid

3.Acetic acid

4.Propanoic acid


Question:
Which one among the following is not a good leaving group?

1.HSO4

2.C?-

3.OH-

4.Br-


Question:
Which one is not a nucleophile?

1.C2H5O-

2.SCN-

3.NH3

4.H3C+


Question:
Which one of following amino acid is neither acidic nor a basic in nature?

1.Lysine

2.Histidine

3.Proline

4.Glutamic acid


Question:
Which one of the following acids is present in lemon juice?

1.Citric acid

2.Benzoic acid

3.Tartaric acid

4.Oxalic acid


Question:
Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone?

1.primary alcohol

2.secondary alcohol

3.tertiary alcohol

4.dihydric alcohol


Question:
Which one of the following molecules does not form alcohol when reacts with Grignard reagent?

1.formaldehyde

2.acetaldehyde

3.propanone

4.carbondioxide


Question:
Which one of the following reactants will be required to form straight chain alcohol by using Grignard reagent

1.formaldehyde

2.ketone

3.ethylene epoxide

4.both a & c


Question:
Which one of the following species is not an electrophile?

1.NH3

2.Br+

3.H+

4.BF3


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