List$-\mathrm{I}$ includes starting materials and reagents of selected chemical reactions. List$-\mathrm{II}$gives structures of compounds that may be formed as intermediate products and/or final products from the reactions of List$-\mathrm{I}$.
 

List-I	List-II
(I)	$\left(\mathrm{P}\right)$
(II)	$\left(\mathrm{Q}\right)$
(III)	$\left(\mathrm{R}\right)$
(IV)	$\left(\mathrm{S}\right)$
	$\left(\mathrm{T}\right)$
	$\left(\mathrm{U}\right)$

Which of the following options has the correct combination considering List$-\mathrm{I}$ and List$-\mathrm{II}$?

• A

  $\left(\mathrm{I}\mathrm{I}\mathrm{I}\right),\mathrm{ }\left(\mathrm{S}\right),\mathrm{ }\left(\mathrm{R}\right)$
• Correct answer
  B

  $\left(\mathrm{I}\mathrm{V}\right),\mathrm{ }\left(\mathrm{Q}\right),\mathrm{ }\left(\mathrm{R}\right)$
• C

  $\left(\mathrm{I}\mathrm{I}\mathrm{I}\right),\mathrm{ }\left(\mathrm{T}\right),\mathrm{ }\left(\mathrm{U}\right)$
• D

  $\left(\mathrm{I}\mathrm{V}\right),\mathrm{ }\left(\mathrm{Q}\right),\mathrm{ }\left(\mathrm{U}\right)$

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