Which of the following compounds has maximum volatility?

  • A
    p-Hydroxybenzoic acid
  • B
    m-Hydroxybenzoic acid
  • C
    o-Hydroxybenzoic acid (Salicylic acid)
  • D
    Benzoic acid

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$I$. $-I$ Effect of the nitro group.
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$III$. Steric effect of the bulky nitro group.

Amongst the following,the total number of compounds soluble in aqueous $NaOH$ is:

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