Which of the following reactants on reaction with conc. $\mathrm{NaOH}$ followed by acidification gives following lactone as the

• A

  
  
• B

  
  
• Correct answer
  C

  
  
• D

  
  

Solution

This compound on acidification to give a compound which have $-\mathrm{CH}_2 \mathrm{OH}$ and $-\mathrm{COOH}$ group, such groups on dehydration to give lactone.

Hence, the correct answer is option: 'C'.