KVPY Sample Paper KVPY Stream-SX Model Paper-27

The product Z in the following reactions sequnce is \[C{{H}_{3}}-\overset{O}{\mathop{\overset{\parallel }{\mathop{C}}\,}}\,-C{{H}_{3}}\xrightarrow[(ii)\,\,{{H}_{2}}O]{(i)\,\,C{{H}_{3}}MgBr}\,(X)\xrightarrow[\text{Ether}]{\text{Na}\,\,\text{Metal}}\]\[(Y)\xrightarrow{C{{H}_{3}}-Br}\,(Z)\]

A) \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,-C{{H}_{2}}\]

B) \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-O-C{{H}_{3}}\]

C) \[C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{\underset{C{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,}}\,-OC{{H}_{3}}\]

D) \[C{{H}_{3}}-\overset{O}{\mathop{\overset{\parallel }{\mathop{C}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}\]

Correct Answer: C

Solution :

\[X=C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-OH\]

\[Y=C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-ONa\]

\[Z=C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-OC{{H}_{3}}\]