ss3 bio

Which of these compounds exhibits resonance ?

               

• Ethanol 

• Ethane  

• Benzene

• Ethyne

Answer explanation

Benzene exhibits resonance due to its alternating double bonds, allowing for delocalization of electrons. This gives benzene its unique stability and characteristic properties, unlike ethanol, ethane, and ethyne which do not have resonance.

The solubility of alkane in organic solvent is due to presence of its

   

• polar molecule     

• non-polar molecule

• Low melting points 

• low freezing            points.

Answer explanation

The solubility of alkanes in organic solvents is primarily due to their non-polar nature. Non-polar molecules dissolve well in non-polar solvents, following the principle "like dissolves like." Thus, the correct choice is non-polar molecule.

.  Which of these is alkane member?

   

• Ethene   

• Pentane    

• Propyne

• Butanol

Answer explanation

Pentane is an alkane, characterized by single bonds between carbon atoms. Ethene is an alkene, Propyne is an alkyne, and Butanol is an alcohol, making Pentane the only correct choice as an alkane member.

One of the following is not a chemical property of ethene.

    

• Polymerization  

• Substitutional

• Hydration   

•   Addition.

Answer explanation

Substitutional is not a chemical property of ethene. Ethene primarily undergoes addition reactions, polymerization, and hydration, but substitution reactions are not typical for alkenes like ethene.

Additional reaction of hydrogen and ethene is known as

       

• polymerization

• additional

• combustion

• hydrogenation

Answer explanation

The additional reaction of hydrogen with ethene is called hydrogenation. This process involves adding hydrogen to unsaturated hydrocarbons, converting them into saturated ones, which is a key reaction in organic chemistry.

The final product of complete reaction between ethyne and hydrogen gas is

           

• ethane

• methyl ethane

• ethane  

• hydroethyne

Answer explanation

The complete reaction between ethyne (C2H2) and hydrogen (H2) results in the saturation of the triple bond, forming ethane (C2H6). Thus, the final product is ethane.