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NEET2019ChemistryHydrocarbonsActual

The most suitable reagent for the following conversion, is:

Options

  1. ANa/liquid N H 3
  2. BH 2 , P d / C , quinoline
  3. CZ n / H C l
  4. DH g 2 + / H + , H 2 O

Correct answer

B. H 2 , P d / C , quinoline

Step-by-step solution

(i) Na/ Liquid NH 3 (Birch reduction) it reduces non-terminal alkynes into alkene (trans/anti addition) (ii) H 2 / P d - C , quinoline (lindlar catalyst) reduces alkyne into alkene by syn addition. This will give the required product. (iii) Z n / H C l is Clemmensen reduction which reduced carbonyl into an alkene. (iv) H g + 2 / H ⊕ , H 2 O is an electrophilic addition reaction, which converts alkyne into ketone.

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