Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Dehydration of alcohol involves

  • carbene

  • carbanion

  • free radical

  • carbonium ion


D.

carbonium ion

The dehydration reaction of alcohols to generate alkene proceeds by heating the alcohols in the presence of a strong acid, such as sulfuric or phosphoric acid, at high temperatures. It involves carbonium ion in its mechanism.


52.

Propionic acid and KOH reacts to produce which one of the following?

  • Potassium propionate

  • Propyl alcohol

  • Propionaldehyde

  • Does not react


A.

Potassium propionate

Propionic acid and KOH reacts to produce potassium propionate.

CH3CH2COOH Propionic acid KOH CH3CH2COOKPotassium propionate + H2O


53.

Gammexane is

  • benzene hexachloride

  • bromo benzene

  • benzyl chloride

  • chlorobenzene


A.

benzene hexachloride

Gammexane is benzene hexachloride. Its IUPAC name is 1,2,3,4,5,6-hexachlorocyclohexane.


54.

Saccharin contains

  • carbon and hydrogen

  • carbon, oxygen and hydrogen

  • carbon, hydrogen, oxygen and nitrogen

  • carbon, hydrogen, sulphur, nitrogen and oxygen


D.

carbon, hydrogen, sulphur, nitrogen and oxygen

Saccharin is an artificial sweetner. It consists of carbon, hydrogen, sulphur, nitrogen and oxygen.


55.

Aniline on treatment with HCl and NaNO2 gives

  • diazo salt

  • nitroaniline

  • chloroaniline

  • aminophenol


A.

diazo salt

When aniline is treated with HCl and NaNO2, it forms benzene diazonium chloride. Therefore, it gives diazo salt. 


56.

A sample of CHCl3 before using as an anaesthetic is tested by

  • AgNO3 solution after boiling with KOH

  • Ammonical cuprous chloride

  • Fehling solution

  • AgNO3


D.

AgNO3

Before using CHCl3 as an anaesthetic, it is treated with aqueous solution of AgNO3. A pure sample does not give ppt with aqueous AgNO3.


57.

The digestion of fat in intestines is aided by

  • emulsification

  • peptisation

  • protection

  • diffusion


A.

emulsification

Digestion of fat in intestines is aided by emulsification, i.e. breaking up of fat globules into much smaller emulsion droplets. The digestive enzyme, pancreatic lipase, is water soluble and can only work at the surface of fat globules. 


58.

Which of the following possess highest melting point?

  • p-dichlorobenzene

  • m-dichlorobenzene

  • o-dichlorobenzene

  • chlorobenzene


A.

p-dichlorobenzene

p-dichlorobenzene molecule has symmetrical structure. It can fit well in its crystal lattice. The intermolecular forces of attraction are strong. Hence, it possesses highest melting point among given options.


59.

When calcium acetate is distilled, it will produce which of the following compound?

  • CH3COOH

  • CH3CHO

  • CH3COCH3

  • All of these


C.

CH3COCH3

Calcium acetate on distillation produce acetone. It can be explained using the following reaction:

Ca(CH3COO)2 Calcium acetate Distillation CH3COCH3Acetone + CaCO3


60.

Which of the following compounds reacts slower than benzene in electrophilic brornination?


A.

Nitro group (-NO2) deactivates the benzene ring in nitrobenzene due to -M effect.