Which of the following statements are correct? (i) Alkynes on reduction with palladised charcoal form cis alkenes. (ii) Alkynes on reduction with palladised charcoal form trans alkenes. (iii) Alkynes on reduction with sodium in liquid ammonia form trans alkenes. (iv) Propyne on reduction with palladised charcoal form a mixture of cis and trans propene.

Question

Which of the following statements are correct? (i) Alkynes on reduction with palladised charcoal form cis alkenes. (ii) Alkynes on reduction with palladised charcoal form trans alkenes. (iii) Alkynes on reduction with sodium in liquid ammonia form trans alkenes. (iv) Propyne on reduction with palladised charcoal form a mixture of cis and trans propene. (A) (i) and (iv) (B) (i) and (iii) (C) (ii) and (iv) (D) (i), (iii) and (iv)

Tardigrade Admin · Accepted Answer

For statement (ii), alkynes on reduction with Pd / C form cis-alkenes. For statement (iv), propyne on reduction with Pd / C forms propene. Propene does not show geometrical isomerism. Only those compounds show geometrical isomerism which have two different atoms or groups attached to each carbon atom.

(i) and (iv)

(i) and (iii)

(ii) and (iv)

(i), (iii) and (iv)

For statement (ii), alkynes on reduction with Pd/C form cis-alkenes. For statement (iv), propyne on reduction with Pd/C forms propene. Propene does not show geometrical isomerism. Only those compounds show geometrical isomerism which have two different atoms or groups attached to each carbon atom.