Question # 1

The reaction of formaldehyde with HCN is

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Nucleophilic substitution

Electrophilic substitution

Nucleophilic addition

Free radical addition

The reagent for alkaline hydrolysis of ethyl bromide to form ethyl alcohol is

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water at room T

Alcoholic KOH+heat

Ethanol + heat

dil. NaOH+ heat

The starting substance for the preparation of iodoform is any of the following, except

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СН3СН(ОН)CН3

CH3CH2ОН

HCH2OH

CH3COCH3

The acidity of phenol is due to its

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Nature of Benzene

Double bond in benzene ring

Natute of phenoxide ion

Hydroxyl group

The species which are produced by heterolytic bond breaking and can act as electron pair donor

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Free radicals

Cations

Nucleophiles

electrophile

Which of the following undergoes easy dehydration?

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3-MethyIbutan-2-ol

Ethanol

2.Methylpropan-2-ol

Methanol

Which of the following is soluble in water?

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СН3ОН

CCL4

CHCI3

CS2

Which compound is obtained hy the elimination reaction on bromoethane?

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Butene

Ethene

Propene

Propane

Which of the following gives positive haloform test and positive Fehling solution

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Acetone

Echanol

Acetaldehyde

Formaldehyde

Which is an intermediate in SN1 reaction

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Ethoxide ion

Carbocation

alkyl halide

alkene

Which of the following alcohols is least reactive with respect to 0-H bond

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CH3OH

CH-CH2-OH

(CH3)2-CH-OH

(CH3)3OH

Which one among the following is not a good leaving group

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HSO4-

CI-

OH-

Br-

Which reactant does hnof liberate water on reaction with alcohol

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NH3

K2Cr2O7/15H2O

HCI

PCI3

A compound z' decolorizes bromine water and produces white ppt. The compound 'z'is

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Alkane

Alcohol

Phenol

Benzene

Identify the compound, which give iodoform test

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Methanol

3- Hexanol

Methyl ketone

Propionaldehyde

For which mechanisms, the first step involved is the same

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E1 and E2

E2 and SN2

E2 and E1

E1 and SN1

Which one of the following is not associated with SN2 mechanism

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100 % inversion of configuration

Tertiar alkyI halides

2nd order kinetics

Change of hy bridization from sp³ to sp² in transition state

Propanone does not undergo

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Oxime formation

Reduction of Fehling solution

Hydrazone formation with hydrazine

Reaction with HCN

The rate of E1 reaction depends upon

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The concentration of substrate

The concentration of substrate as well as nucleophile

The concentration Nucleophilic

Nature of Catalyst

Relative acidic strength of alcohol, phenol, water and carboxylie acid is

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Carboxylic acid > Alcohol > Phenol > Water

Carboxylic acid > Phenol > Water> Alcohol

Water > Alcohol> Phenol > Carboxylic acid

Phenol > Carboxylic acid > Alcohol> Water

which of the following is not a symmetrical ketone

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4-heptanone

Butanone

Propanone

3-pentanone

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