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Question

Chemistry Question on Hydrocarbons

Which one is the correct order of acidity ?

A

CH≡CH>CH3−C≡CH>CH2=CH2>CH3−CH3CH \equiv CH > CH_3 - C \equiv CH > CH_2 = CH_2 > CH_3 - CH_3

B

CH≡CH>CH2=CH2>CH3−C≡CH>CH3−CH3CH \equiv CH > CH_2 = CH_2 > CH_3 - C \equiv CH > CH_3 - CH_3

C

CH3−CH3>CH2=CH2>CH3−C≡CH>CH≡CHCH_3 - CH_3 > CH_2 = CH_2 > CH_3 - C \equiv CH > CH \equiv CH

D

CH2=CH2>CH3−CH=CH2>CH3−C≡CH>CH≡CHCH_2 = CH_2 > CH_3 - CH = CH_2 > CH_3 - C \equiv CH > CH \equiv CH

Answer

CH≡CH>CH3−C≡CH>CH2=CH2>CH3−CH3CH \equiv CH > CH_3 - C \equiv CH > CH_2 = CH_2 > CH_3 - CH_3

Explanation

Solution

Correct order is

H−C≡C−H(Two acidic hydrogens)>H3C−C≡COne acidic hydrogen)−H>H2C=CH2>CH3−CH3\underset{\text{(Two acidic hydrogens)}}{H - C\equiv C - H} > \underset{\text{One acidic hydrogen)}}{H_3 C - C \equiv C} - H> H_2C= CH_2 >CH_3 - CH_3