Which will form lactone on treatment with $NaOH$?

  • A
    $\alpha$-Bromo acid
  • B
    $\beta$-Bromo acid
  • C
    $\gamma$-Hydroxy acid
  • D
    $\delta$-Bromo acid

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Propionic acid is subjected to reduction with hydroiodic acid in the presence of a little $P$,the product formed is

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If oxalic acid is treated with conc. $H_2SO_4$,then the gases formed will be:

Considering the acidity of carboxylic acids:
$(I) PhCOOH$
$(II) o-NO_2C_6H_4COOH$
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What is the correct order of acidic strength?

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