Assertion : Staggered conformation of ethane is 12.5 kJ mol-1 mor

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

281.

Which of the following alkenes will give same product by any method out of hydration, hydroboration-oxidation and oxymercuration-demercuration? 

  • CH3CH=CH2

  • CH3CH=CHCH3

  • CH3CH(CH3)CH=CH2


282.

The compound formed by the ozonolysis of acetylene :

  • glycol

  • acetic acid

  • ethylene ozonide

  • glyoxal


283.

The compound which have conjugate double bond :

  • butyne

  • butylene

  • isobutylene

  • butadiene


Advertisement

284.

Assertion : Staggered conformation of ethane is 12.5 kJ mol-1 more stable than the eclipsed conformation.

Reason : The two conformations of ethane cannot be separated at room temperature.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


B.

If both assertion and reason are true but reason is not the correct explanation of assertion

Staggered conformation is more stable because in this conformation any two hydrogen atoms on adjacent carbon atoms are as far apart as possible and the repulsion between the electron clouds of σ- bonds of two non-bonded hydrogen atoms is minimum.

The energy difference of 12.55 kJ mol-1 is not large enough to prevent rotation at room temperature as a result it is not possible to seperate the two conformations of ethane.


Advertisement
Advertisement
285.

The C-H bond energy in ethane , ethene and ethyne :

  • more in ethene

  • more in ethane

  • more in ethyne

  • same in all these


286.

The IUPAC name of the given compound is (CH3)3CCH2C(CH3)3

  • 2, 3,4,4-tetramethylpentane

  • 1, 2, 2, 4-tetramethylpentene

  • 2,2,4, 4-tetramethylpentane

  • 3, 3-dimethylpentane.


287.

What is 'A.' in the following reaction?


288.

Assertion: Saturated hydrocarbons are chemically less reactive.

Reason : All isomeric paraffins have same parent name.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


Advertisement
289.

Assertion: Chloroform is stored in dark coloured bottles.

Reason: Chronic chloroform exposure may cause damage to liver and kidneys.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


290.

Assertion : Saturated hydrocarbons are chemically less reactive.

Reason: All isomeric paraftins have same parent name.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


Advertisement