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Viva questions for Physics Class 12
विज्ञान 10 – महत्वपूर्ण MCQs
Fundamentals of Arithmetic
Science 10 – Important MCQs

Preparation of Alkenes Quiz

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Question 1 of 9

1. Question

What is/are the composition of the Lindlar catalyst?

Palladium on an aluminum support deactivated with poisons like sulphur compounds or quinoline

palladised charcoal partially deactivated with poisons like lead or sulphur compounds or quinoline

Palladium on a calcium carbonate support deactivated with poisons like sulphur compounds or quinoline

Palladised charcoal deactivated with poisons like aluminium compounds or Phosphorus

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Question 2 of 9

2. Question

What is the main function of the Lindlar catalyst?

Hydrogenation of alkynes to alkanes

Reduction of alkenes to alkanes

Reduction of alkynes to alkenes

Hydrogenation of alkynes to alkenes

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Question 3 of 9

3. Question

What makes the Lindlar catalyst selective in its hydrogenation reactions?

The addition of lead

The addition of quinoline

The use of a calcium carbonate support

All of the mentioned

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Question 4 of 9

4. Question

What is the role of lead/sulphur in the Lindlar catalyst?

To increase the rate of hydrogenation

To improve the selectivity of the catalyst

To prevent over-reduction of the substrate

To stabilize the palladium on the support

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Question 5 of 9

5. Question

How will you prepare cis-alkene from alkyne?

Hydrogenation in presence of Lindlar’s catalyst

reduction with sodium in liquid ammonia

heating with alcoholic potash

on heating with concentrated sulphuric acid

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Question 6 of 9

6. Question

How will you prepare trans-alkene from alkyne?

on heating with concentrated sulphuric acid

heating with alcoholic potash

reduction with sodium in liquid ammonia

Hydrogenation in presence of Lindlar’s catalyst

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Question 7 of 9

7. Question

How will you prepare alkene from alkyl halides?

treatment with zinc metal

reduction with sodium in liquid ammonia

heating with alcoholic potash

on heating with concentrated sulphuric acid

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Question 8 of 9

8. Question

How will you prepare alkene from vicinal dihalides?

reduction with sodium in liquid ammonia

treatment with zinc metal

on heating with concentrated sulphuric acid

heating with alcoholic potash

Correct

Incorrect
Question 9 of 9

9. Question

How will you prepare alkene from alcohols?

reaction with Zn and water

heating with alcoholic KOH

heating with zinc metal

heating with concentrated sulphuric acid

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Points Table
Viva questions for Physics Class 12
विज्ञान 10 – महत्वपूर्ण MCQs
Fundamentals of Arithmetic
Science 10 – Important MCQs

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