MCQ
The best sequence of reactions to prepare $2$ -heptanone is
  • A
    $propyne \xrightarrow{NaN{{H}_{2}}}X\xrightarrow{n-\,{{C}_{4}}{{H}_{2}}Br}Y\xrightarrow[{{H}_{2}}S{{O}_{4}}]{{{H}_{2}}O,H{{g}^{2+}}}$
  • $ethyne \xrightarrow{NaN{{H}_{2}}}X\xrightarrow{n-\,{{C}_{5}}{{H}_{12}}Br}Y\xrightarrow[{{H}_{2}}S{{O}_{4}}]{{{H}_{2}}O,H{{g}^{2+}}}$
  • C
    $1 - hexyne \xrightarrow{NaN{{H}_{2}}}X\xrightarrow{\,C{{H}_{2}}Br}Y\xrightarrow[{{H}_{2}}S{{O}_{4}}]{{{H}_{2}}O,H{{g}^{2+}}}$
  • D
    $1- pentyne \xrightarrow{NaN{{H}_{2}}}X\xrightarrow{\,{{C}_{2}}{{H}_{5}}Br}Y\xrightarrow[{{H}_{2}}S{{O}_{4}}]{{{H}_{2}}O,H{{g}^{2+}}}$

Answer

Correct option: B.
$ethyne \xrightarrow{NaN{{H}_{2}}}X\xrightarrow{n-\,{{C}_{5}}{{H}_{12}}Br}Y\xrightarrow[{{H}_{2}}S{{O}_{4}}]{{{H}_{2}}O,H{{g}^{2+}}}$
b

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