Hydrocarbons

The homologue of ethyne is

• C₂H₂

• C₂H₆

• C₃H₈

• C₃H₄

Which one of the following alkenes will react faster with H₂ under catalytic hydrogenation conditions?

(R = Alkyl substituent)

The least energetic conformation of cyclohexane is:

• Boat form

• Half chair form

• Chair form

• Twisted form

By which one of the following compounds both CH₄ and CH₃ - CH₃ can be prepared in one step?

• CH₃I

• CH₃OH

• CH₃CH₂I

• C₂H₅OH

Predict the product:

The reduction of 4-octyne with H₂ in the presence of Pd/CaSo₄ quinoline gives:

• trans-4-octene

• cis-4-octene

• a mixture of cis and trans-4-octene

• a completely reduced product C₈H₁₈

Addition of which of the following reagents to alkene is stereospecific:

I.Br₂          II. KMnO₄

III. BH₃ THF/H₂O₂.NaOH

Select the correct reagent:

• Both I and II

• Both II and III

• Both I and III

• I, II and III

Butyne-1 and butyne-2 can be distinguished by

• H₂SO₄

• AgNO₃ + NH₄OH

• K₂Cr₂O₇

• NH₄OH

An unknown silver salt of monoacidic alkyne contains 67.08% silver. The structure of the alkyne is:

• ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{CH}$

• ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{CH}-{\mathrm{CH}}_3$

• ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{C}\equiv \mathrm{CH}$

• $\mathrm{CH}\equiv \mathrm{CH}$

What is obtained, when potassium succinate soluton is electrolysed ?

• Ethane

• Ethene

• Ethyne

• All of these