Which one is the correct order of acidity ?

1.	Which one is the correct order of acidity ?
Answer» `CH-=CH gt CH_3 -C -=CH gt CH_2 =CH_2 gt CH_3 -CH_3` `CH-=CH gt CH_2 =CH_2 gt CH_3 -C -=CH gt CH_2- CH_3` `CH_3-CH_3 gt CH_2 =CH_2 gt CH_3 -C -= CH gt CH-=CH` `CH_2=CH_2 gt CH_3 -CH=CH_2` Solution :`+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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