91影视

The acidic character depends upon the % S character in the molecule.
Higher is the S character,Higher is the acidity. The order of acidic strength in hybridization is

sp > sp²> sp³

a)

The ethyne molecule is most acidic compared to others due to more s character whereas in the case of acetaldehyde and ethene which have similar hybridization. 鈥淥鈥� atom being more electronegative (in the case of acetaldehyde).Although a +I group is attached to the carbonyl carbon, here resonance will dominate for deciding the acidic strength the alpha H will be more acidic to form enolate ion. Thus, acetaldehyde is more acidic than ethene. Followed by ethane.

The order is represented as follows:

b)

In this case, the two carbonyl carbon attached to two OCH₃ group are more acidic as there will be resonance between the two oxygen, followed by two carbonyl carbon with one OCH₃ group, and then two carbonyl groups with H and lastly formaldehyde as it doesn鈥檛 contain $伪$hydrogen.

The order is represented as follows:

c)

The oxygen atom is more electronegative and is more acidic than the N atom followed by the nitrogen atom containing $伪$hydrogens is more acidic, and lastly, cyclohexanone which doesn鈥檛 involve resonance nor it has $伪$hydrogen.

The order is represented as follows: