Every question from past board papers on Alkynes: acidic character and addition reactions, newest paper first. Open any question for its full worked answer.
Identify the final product [D] obtained in the following sequence of reactions.
\(\mathrm{CH_3CHO \xrightarrow[ii)\ H_3O^+]{i)\ LiAlH_4} [A] \xrightarrow[\Delta]{H_2SO_4} [B] \xrightarrow{HBr} [C]}\), then [C] + bromobenzene \(\xrightarrow{Na/dry\ ether}\) [D]
The most suitable reagent for the following conversion, is :
\(H_3C-C\equiv C-CH_3 \to\) cis-2-butene
Predict the correct intermediate and product in the following reaction :
\(H_3C-C\equiv CH \xrightarrow[HgSO_4]{H_2O,\ H_2SO_4}\) intermediate (A) \(\rightarrow\) product (B)
Which one is the correct order of acidity ?
In the reaction \(H-C\equiv CH \xrightarrow[(2)\ CH_3CH_2Br]{(1)\ NaNH_2/liq.NH_3} X \xrightarrow[(2)\ CH_3CH_2Br]{(1)\ NaNH_2/liq.NH_3} Y\), X and Y are :
