Question

Assertion: Raney Ni is used as a catalyst in Sabatier senderens reaction
Reason: due to large surface area Raney Ni has high catalytic activity
(A) The Assertion and Reason are correct; Reason is the correct explanation for Assertion
(B) The Assertion and Reason are correct; Reason is not the correct explanation for Assertion
(C) Assertion is true but Reason is false.
(D) Assertion is false but Reason is true.

Answer 1

Hint: The process of Ni-based hydrogenation of unsaturated alkenes into saturated alkanes is the Sabatier-Senderens reaction. The critical parameters for these reactions are purity of nickel and temperature of the reaction. The catalyst used in this reaction is Raney Ni which is a fine-grained solid particle.

Complete step by step solution:
Given statement, Assertion: Raney Ni is used as a catalyst in Sabatier-Senderens reaction
Let us check if this statement is true or not.
Sabatier-Senderens reaction is the process of nickel-based hydrogenation and converting the unsaturated hydrocarbons into the saturated hydrocarbons by passing through the vapour of organic molecules and hydrogen over hot Raney Ni solid particles.
${{C}_{n}}{{H}_{2n}}+{{H}_{2}}\overset{Ni}{\mathop{\to }}\,{{C}_{n}}{{H}_{2n+2}}+heat$
In this reaction, Raney Ni is used as a catalyst which is finely grained solid particles of nickel extracted from Ni-Al alloy. This surface area of nickel increases when it is used as a finely grained particle size. Because the surface area is large for Ni, the catalytic activity increases. Further, the rate of Sabatier-Senderens reaction increases with increasing the surface area of Raney Ni.
Hence, the Assertion is true and the Reason statement will be the correct explanation for the Assertion.

So, the correct option is A, The Assertion and Reason are correct; Reason is the correct explanation for Assertion.

Note: The Sabatier-Senderens reaction is a reduction reaction that has an important application in organic synthesis and the transformation of carbon monoxide or carbon dioxide into organic compounds. This reduction reaction has been extensively modified as Fischer-Tropsch synthesis has been latter developed as a heterogeneous hydrogenation catalyst that works at atmospheric pressure.