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Question

The correct order for acid strength of compounds CHCH,CH3CCH and CH2=CH2 is as follows:

A
CH3CCH>CH2=CH2>HCCH
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B
CH3CCH>CHCH>CH2=CH2
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C
HCCH>CH3CCH>CH2=CH2
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D
CHCH>CH2=CH2>CH3CCH
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Solution

The correct option is C HCCH>CH3CCH>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 CH 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 CH3CCH decreases acidic strength of the compound. Hence the correct order of acidic strength is


Hence, option (d) is correct.

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