Question

Statement 1: The addition of ${H_2}$ to ethene will form an unsaturated compound called ethane.
Statement 2: Ethane has as many hydrogen atoms bonded to the carbon atoms as possible.
A.Both Statement 1 and Statement 2 is the correct explanation of Statement 1

B.Both Statement 1 and Statement 2 is not the correct explanation of Statement 1

C.Statement 1 is correct but Statement 2 is not correct

D.Statement 1 is not correct but Statement 2 is correct

Answer 1

Hint: The addition of hydrogen is known as hydrogenation. Ethane is an unsaturated hydrocarbon. It is an alkene and can be easily converted into an alkane by hydrogenation. Hydrogenation is the process of breaking the double bond of an unsaturated compound and replacing it with two hydrogen atoms.

Complete step by step answer:
The alkene is an unsaturated hydrocarbon that contains a double bond.
The conversion of alkanes to alkanes involves a process known as catalytic hydrogenation. Hydrogen is introduced to the alkene in the presence of a fine catalyst like nickel, platinum, or palladium in this process. The role of the catalysts is that it helps in breaking the double bond of the alkene into a single bond to form alkane by the addition of hydrogen. This reaction is known as catalytic hydrogenation.
In this there are two types of compounds : saturated and unsaturated compounds. Alkanes are known as saturated compounds while alkene and alkynes are unsaturated compounds.
The ethane molecular formula is $C{H_3}C{H_3}$ and ethane has a molecular formula of $C{H_2} = C{H_2}$ and it consists of a double bond.
So we can say that hydrogenation is a reduction process because the addition of hydrogen takes place after breaking the bond.
Ethene reacts with hydrogen in the presence of a finely divided nickel catalyst at a temperature of about ${150^0}C$, Ethane is produced.
$C{H_2} = C{H_2} + {H_2}\xrightarrow{{Ni}}C{H_3}C{H_3}$
The conversion of an unsaturated alkene to saturated alkane in the presence of a catalyst and very high temperature for this reaction required.
Thus the first statement is incorrect.
In this reaction due to the presence of double bond-breaking hydrogen atoms move towards carbon.
Thus the second statement is correct.
Therefore the correct answer is (D).

Note:
Hydrogenation occurs, the hydrogen changes its valency from 0 to $ + 1$ which needs strong reducing agents. This nickel is used as catalysts. They can easily convert the alkene to alkane to undergo hydrogenation reactions. This is the reason for its usage in hydrogenation reactions and thus acts as strong reducing agents.