Question # 1

Which one of the following gases is used in welding purpose usually

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Methane

Ethane

Ethene

Acetylene

To product aldehyde group against alkaline oxidizing agent.

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It is reduced in the presence of catalyst

An acetal is formed

It is oxidized

It is treated with aqueous NaBH4

Plastics are a pollution problem because many plastics

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

According to Lewis concept, ethers behave as

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Acid

Base

Nucleophile

Solvent

The carbon atom of carbonyl group is hybridized

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Sp

Sp²

Sp³

dsp²

Ecosystem is smaller unit of

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Lithosphere

Hydroshpere

Amosphere

Biosphere

Which one of the following elements exhibits s-inert pair effect.

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B

Al

Pb

Sc

Which substance is used to convert Grignard reagent to alkane.

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H2O

NH3

Ethyl alcohol

All of these

Which one of the following compounds is not derivative of NH3.

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Aniline

Hydrazine

Phenyl hydrazine

Picric acid

Conversion of phenol to benzene is known as.

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Oxidation

Reduction

Hydrolysis

Hydration

Flavour of ethyl butyrate is

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Orange

Pine apple

Banana

Apricot

Which statement is incorrect about H2SO4

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Dehydration agent

dibasic acid

Oxidizing agent

Reducing agent

Cholesterol is an important precursor in the biosynthesis of

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Sex harmonies

Adrenal hormones

Vitamin D

All of these

m-choronitro benzene is prepared by

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Nitration of chlorobenzene

Nitration of Benzene

Chlorination of Nitrobenzene

Nitration of m-chlorobenzene

Which one of the following has highest melting and boiling points.

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HF

HBr

HCl

HI

All of the followings react with Fehling solution except

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CH2CH2CHO

CH3-CH2COCH3

HCHO

CH3-CHO

Which substance usually undergo nucleophilic addition reactions.

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Benzenes

Aldehydes

Alkenes

All of these

What is the function of Head box in paper making machine.

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It reduces the thickness of paper

It dry the paper

It discharge teh pulp at the screen of fourdrinier table

Web structure is consolidated

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