Question

R -CH₂ -CCl₂ - R □(→┴Reagent )R -C ≡ C- R
The reagent is
(a) Na (b) HCl in H₂O
(c) KOH in C₂H₅OH (d) Zn in alcohol.

Answer 1

Answer:

R -CH₂ -CCl₂ - R □(→┴Reagent )R -C ≡ C- R

The reagent is

(a) Na

(b) HCl in H₂O

(c) KOH in C₂H₅OH✔✔

(d) Zn in alcohol.

Answer 2

KOH in C₂H₅OH  is the reagent of choice.

Explanation:

• The ethanoic potassium hydroxide is a very strong acidic reagent.

• This reagent can induce hydrogenation in the haloalkanes and produce alkene and alkynes.

• The reactant is the R -CH₂ -CCl₂ - R which has two halo groups in the same carbon.

• This leads to a two phase reaction.

• As the reactant is processed with ethanoic potassium hydroxide, first a double bond is initiated as one of the chlorine group is ejected out along with a hydrogen from alpha bond.

• This product again goes into a reaction where the second chlorine group is taken in along with other hydrogen to form the triple bond between the subsequent carbon atoms.

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