The correct order for acid strength of compounds CH≡CH,CH3−C≡CH and CH2=CH2 is as follows:
A
CH3−C≡CH>CH2=CH2>HC≡CH
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B
CH3−C≡CH>CH≡CH>CH2=CH2
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C
HC≡CH>CH3−C≡CH>CH2=CH2
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D
CH≡CH>CH2=CH2>CH3−C≡CH
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Solution
The correct option is CHC≡CH>CH3−C≡CH>CH2=CH2 Alkynes having sp - hybridised carbon has maximum s - character and hence maximum electronegativity so that it attracts the electron pair of the bond C−H to a greater extent and makes the removal of proton easier than the alkenes having sp2 hybridised carbon.
Now presence of electron donating group −CH3 in alkyne CH3−C≡CH decreases acidic strength of the compound. Hence the correct order of acidic strength is