Question

Cyclobutane reacts with hydrogen gas in the
presence of nickel catalyst at 200°C to give__(1
marks)
Ans.
3-Butene
Butane
1-Butene
2-Butene​

Answer 1

Answer:

The cyclobutane ( $C_{4}H_{8}$ ) reacts with hydrogen gas ( $H_{2}$ ) in the presence of the nickel catalyst ( $Ni$ ) at $200\textdegree C$ to give butane.

Therefore, option b) Butane is correct.

Explanation:

The cyclobutane ( $C_{4}H_{8}$ ) reacts with hydrogen gas ( $H_{2}$ ) in the presence of the nickel catalyst ( $Ni$ ) at $200\textdegree C$ to give ______.

The reaction occurring here is catalytic hydrogenation.

Catalytic hydrogenation:

• Hydrogenation reduces the double and triple bonds in the hydrocarbons.
• Catalytic hydrogenation involves the chemical reaction by the use of molecular hydrogen to saturate the compounds in the presence of catalysts like nickel, palladium, or platinum.

In the given reaction, the catalyst used is nickel.

The hydrogenation reaction of cyclobutane follows:

• $C_{4}H_{8} + H_{2} \xrightarrow[\text{200\textdegree C}]{\text{Ni}} CH_{3}CH_{2}CH_{2}CH_{3}$
•                                     ( butane )

Also, refer to the attached reaction, for the open structure of cyclobutane.

Hence, the cyclobutane ( $C_{4}H_{8}$ ) reacts with hydrogen gas ( $H_{2}$ ) in the presence of the nickel catalyst ( $Ni$ ) at $200\textdegree C$ to give butane.