
- ✓Fluorobenzene
- BBenzene
- C$1, 4$ -difluorobenzene
- D$1, 3$ -difluorobenzene


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Benzene $(C_6H_6)$ $+\,C{{H}_{3}}-CH=C{{H}_{2}}\,\xrightarrow{{{H}^{\oplus }}}A\xrightarrow{{{O}_{2}}}B$ $\xrightarrow{{{H}^{\oplus }}\,/\,\Delta }C+$$\begin{matrix}
O \\
|| \\
C{{H}_{3}}-C-C{{H}_{3}} \\
\end{matrix}$
The structure of intermediate compound $'B'$ will be
$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2}OC{H_3}} \\
| \\
{\mathop {C{H_3}CHBr}\limits_{(R)} }
\end{array}$ $\xrightarrow[{acetone}]{{NaCN}}$ $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2}OC{H_3}} \\
| \\
{\mathop {C{H_3}CHCN}\limits }
\end{array}$
$A +$ alkali $\rightarrow B$ (Major Product)
If $B$ is an oxoacid of phosphorus with no $P - H$ bond, then $A$ is ..... .