Which of the following statements is not applicable to carbon compounds ?

• They have low melting and boiling points .

• They are ionic in nature                  

• They from homologous series

• They are generally soluble in organic solvents.

  The correct formula of formaldehyde is given by

• HCHO       

• CH₃ CHO          

• C₂H₅CHO 

• none of these

   Carbonic acids are compounds

• containing – OH group attached to alkyl group

• containing – CO group attached to alkyl  groups

• Containing – CHO group attached to alkyl group

• containing- COOH group attached to alkyl group

Water gas consists of

• water vapour and dust                 

• a mixture of carbon monoxide and hydrogen

• a mixture of carbon monoxide and nitrogen  

• water vapour and methane

Which of the following gas is known as illuminating gas ?

• Ethane   

• Ethene    

• Ethyne        

• Propane

  The double bond between the two carbon atoms in the C₂H₄ molecule indicates

• two pairs of mobile electrons        

• two pairs of shared electrons   

• two pairs of unpaired electrons      

• two pairs of lone electrons

Alkenes and alkynes are

• saturated aliphatic hydrocarbons       

• unsaturated aliphatic hydrocarbon

• unsaturated aromatic hydrocarbon       

• cyclic hydrogen

  Which of the following compounds have a ring- carbon chain structure ?

• Ethane           

• Ethene

• Ethyne

• Benzene

   The structural formula of 2-butene is

• CH₃ – CH= C= CH₂         

• CH₃-C= C- CH₃             

• CH₃ = CH-CH₂ –CH₃  

• CH₃ –CH= CH-CH₃

  Maximum number of bonds between two atoms of a covalent bond can be

• four                      

• two         

• three           

• one