Hydrocarbons

Question 1

Which electrophilic substitution reaction of benzene is reversible

Answer 1

Sulphonation

Question 2

Iodination of alkane is carried out in the presence of

Answer 2

HNO₃ and HIO₃

Question 3

How is alkene obtained from alkynes?

Answer 3

• Lindlar catalyst (H₂ Pd/C with S)
  
  • cis addition
• Na/ NH₃
  
  • trans
• LiAlH₄
  
  • trans

Question 4

Wurtz reaction

Answer 4

When haloalkanes are treated with Na in dry ether, alkane with double the number of C- atom is formed

Question 5

Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by

Answer 5

Cracking

Question 6

What happens when methane and nickel react?

Answer 6

CH4 + H2O → CO + 3H2

steam methane reforming (SMR)

Question 7

Function of anhydrous aluminium chloride in Friedel crafts

Answer 7

To produce electrophile

Question 8

How to identify aromatic structure

Answer 8

• be cyclic
• have (4n + 2) pi electrons

Question 9

Acidic nature of alkynes

Answer 9

• In alkynes H attached to C≡C is acidic in nature
• only terminal alkynes are acidic

CH≡CH + NaNH₂ –> NaC≡CNa
CH₃C≡CH + Tollens –> CH₃C≡C-Ag

Question 10

Infinite number of spatial arrangements of atoms obtained as a result of free rotation about C-C bond

Answer 10

Conformations
OR
Rotamers