The most acidic hydrogen is present in:

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The acidity of hydrocarbons depends on the hybridization of the carbon atom to which the hydrogen is attached. The acidity order is: terminal alky

Vedclass · Accepted Answer

Ethyne

Vedclass · Answer

(A) The acidity of hydrocarbons depends on the hybridization of the carbon atom to which the hydrogen is attached. The acidity order is: terminal alkynes ($sp$ hybridized) > alkenes ($sp^2$ hybridized) > alkanes ($sp^3$ hybridized).$1$. In ethyne $(HC\equiv CH)$,the carbon is $sp$ hybridized,which has $50\%$ $s$-character. This makes the $C-H$ bond more polar and the conjugate base (acetylide ion) more stable.$2$. In ethene $(CH_2=CH_2)$,the carbon is $sp^2$ hybridized ($33.3\%$ $s$-character).$3$. In ethane $(CH_3-CH_3)$,the carbon is $sp^3$ hybridized ($25\%$ $s$-character).$4$. In benzene $(C_6H_6)$,the carbon is $sp^2$ hybridized.Therefore,ethyne contains the most acidic hydrogen.

Similar Questions

What is the major product obtained when propyne reacts with aqueous $H_2SO_4$ in the presence of $HgSO_4$?

Which of the following hydrocarbons forms a salt?

For the alkyne with formula $C_6H_{10}$,the number of alkynes with acidic hydrogens is $x$ and the number of alkynes with no acidic hydrogens is $y$. $x$ and $y$ are respectively:

The synthesis of $3-$octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are

$CH_3-C \equiv C-O-CH_3 \xrightarrow{dil. H_2SO_4, HgSO_4} \text{major product}$

Vedclass Test Series

Exam Paper Generator

Online Exam Module