1.

Which one is the correct order of acidity ?A. `CH-=CH gt CH_3 -C -=CH gt CH_2 =CH_2 gt CH_3 -CH_3`B. `CH-=CH gt CH_2 =CH_2 gt CH_3 -C -=CH gt CH_2- CH_3`C. `CH_3-CH_3 gt CH_2 =CH_2 gt CH_3 -C -= CH gt CH-=CH`D. `CH_2=CH_2 gt CH_3 -CH=CH_2`

Answer» Correct Answer - A
`+I`-Effect of `CH_3` group increases the electron-density in the C-H bond thereby decreasing its tendency to release a proton. Thus, propyne is less acidic than ethyne. Thus, the acidity of ethane, ethene , ethyne and propyne decreases in the order : option (a) is correct.


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