Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETChemistryd and f Block Elements

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The oxidation of ethyne to ethanal is catalysed by a compound of a 3d-series transition element. Reason (R): Palladium chloride ( PdCl ₂ ) catalyses the oxidation of ethyne to ethanal, and palladium belongs to the 4d-series of transition elements. In the light of the above statements, choose the mo

Options

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. CAssertion is true but Reason is false.
  4. DAssertion is false but Reason is true.

Correct answer

D. Assertion is false but Reason is true.

Step-by-step solution

Assertion (A) is false because the oxidation of ethyne to ethanal is catalysed by PdCl ₂ (Wacker process), and palladium (Pd) is a 4d-series transition element (Group 10), not a 3d-series element. A student might incorrectly assume it is a 3d element if they confuse it with nickel complexes which are used for alkyne polymerisation. Reason (R) is true because palladium chloride ( PdCl ₂ ) is indeed the catalyst for this reaction, and palladium is located in the 4d series of the periodic table. Therefore, Assertion i

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because : 2026The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of Ce =58 , Nd =60 , Tb =65 and Ho =67 ) 2026The green paramagnetic species formed by heating KMn O₄ at 513 K is 2026The calculated 'spin-only' magnetic moment of Ti ²⁺ (3d^2) is : 2026Match List I with List II : List I (Transition metal/compound/complex) List II (Catalytic Role) A. V ₂ O ₅ I. Preparation of ammonia from N ₂/ H ₂ mixture B. Fe II. Polymerisation 2026Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Generally, 3d transition metals have high melting points. Reas 2026Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number of unpaired electrons in a Cr ²⁺ ion ( Z 2025Which of the following set of ions act as oxidising agents? 2024 Full d and f Block Elements list All NEET PYQs