Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

How many isomeric butanes are there?

  • 2

  • 3

  • 4

  • 5


42.

Which of the following will show geometrical isomerism?

  • 1-butene

  • 2-butene

  • 2-methyl propene

  • Propene


43.

Calcium carbide reacts with water to produce

  • methane

  • ethane

  • ethylene

  • acetylene


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44.

Aromatic properties of benzene are proved by

  • aromatic sextet theory

  • resonance theory

  • molecular orbital theory

  • All of the above


D.

All of the above

The necessary and sufficient conditions for a compound to be aromatic are:

(i) It should be cyclic with alternate single and double bonds and the cyclic π-electron cloud should surround all the carbon atoms at the ring. 

(ii) It should be planar.

(iii) It should contain (4n + 2) π-electrons where, n = 0, 1, 2, 3,.... etc.


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45.

Marsh gas primarily contains

  • C2H2

  • CH4

  • H2S

  • CO


46.

n-propyl alcohol and iso-propyl alcohol are examples of

  • position isomerism

  • chain isomerism

  • tautomerism

  • geometrical isomerism


47.

Optical isomerism is shown by

  • butanol-1

  • butanol-2

  • butene-1

  • butene-2


48.

Heating together of sodium ethoxide and ethyl iodide wll give

  • ether

  • ethyl alcohol

  • acetaldehyde

  • acetic acid


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49.

Benzene hexachloride is used as

  • dye

  • antimalarial drug

  • antibiotic

  • insecticide


50.

One mole of a solute A is dissolved in a given volume of a solvent. The association of the solute takes place according to nA  [A]n. The van't Hoff factor (i) is expressed as:

  • i = 1 - x

  • i = 1 + xn

  • i = 1 - x + xn1

  • i = 1


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