Question

the strongest acid is C2H2,C6H6,C2H6,CH3OH

Answer 1

Among the given series, the strongest acid is $CH_3OH$.

Explanation:

• The acidity of the substance can be identified by its pKa value. The lower the pKa value of a substance, the more acidic it is in nature.
• 'Ka' is called acid dissociation constant whereas 'pKa' is called a -log of 'Ka'.
• The pKa values for the acids given in the series are as follows:

1. $C_2H_2$ - 25
2. $C_6H_6$ - 43
3. $C_2H_6$ - 50
4. $CH_3OH$ - 15.5

• From the above pKa value, as the compound $CH_3OH$ has lower pKa value it is considered as strongest acid.
• As the pKa value of compound $C_2H_6$ is high it is considered weak acid.

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