Question # 1

All of the followings react with Fehling solution except

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CH2CH2CHO

CH3-CH2COCH3

HCHO

CH3-CHO

The benzene molecule contains.

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Three double bonds

Two double bonds

One double bonds

Delocalized sigma electron charge

Which compound form benzoic acid on oxidation with strong oxidizing agent.

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Toluene

Ethyl benzene

n propyl benzene

All

Boric acid cannot be used

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As antiseptic in medicine

For washing eyes

In soda bottles

For Enamals and Glazes

The composition of oleum is.

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H2SO4

H2S2O3

H2S2O7

H2S3O7

Which one of the following can best be used to distinguish between samples of ethane and ethene

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Aqueous BaCl2

Aqueous bromine

Lime water

Litmus solution

In group VA elements the most electronegative elements is.

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Sb

N

P

As

Which one is perchloric acid

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HClO

HClO₃

HClO₄

Maximum number of unpaired electrons is in

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O₂

O₂⁺

O₂^-

O₂^2-

Select from the following the one which is Alcohol

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CH₃CH₂OH

CH₃OCH₃

CH₃COOH

CH₃.CH₂.Br

Boron usually exist in nature as

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Borides

Oxborates

Free element

It is a artificial element

The reactivity of Grignard's regent is due to

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Polarity of Mg-x bond

Polarity of C-Mg bond

Electro negativity of halogen atom

Presence of Mg-atom

Formalin is

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

Which one of the followings is not observed in the combustion of pure methane in a plentiful supply of air

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Water in produced

CO2 is produced

The flame is smoky

Energy is released

Which one is alcohol in the following

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CH₃.CH₂.OH

CH₃.O.CH₃

CH₃COOH

CH₃.CH₂.Br

Which one of the following elements burns in air to form an oxide which, when shaken with water, give a solution with a pH greater than 7.

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Carbon

Magnesium

sulphur

Hydrogen

According to Lewis concept ethers behave as

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Acid

Base

Acid as well as a base

Noe of them

Which one is a disaccharide

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Glucose

Sucrose

Fructose

Cellulose

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