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તો $A$ શું છે.
$(CH_3)_2C(Cl)CH_2CH_2CH_2OH \to HCl + C_6H_{12}O$
$\begin{align} (A)\,Nu+R-L\to \overset{\oplus }{\mathop{Nu}}\,-R+{{L}^{-}} \\ (B)\,R-{{L}^{\oplus }}\to {{R}^{\oplus }}+:L \\ \end{align}$