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(C) The $Reimer-Tiemann$ reaction involves the treatment of phenol with $CHCl_3$ in the presence of aqueous $NaOH$,which leads to the introduction of

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Reimer-Tiemann reaction

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(C) The $Reimer-Tiemann$ reaction involves the treatment of phenol with $CHCl_3$ in the presence of aqueous $NaOH$,which leads to the introduction of a $-CHO$ group at the ortho position of the benzene ring. This process involves the formation of a new $C-C$ bond between the benzene ring and the dichlorocarbene intermediate $(:CCl_2)$.$1.$ Hydroboration-Oxidation of alkenes involves the addition of $H_2O$ across a double bond.$2.$ Cannizzaro reaction is a disproportionation reaction of aldehydes lacking $\alpha$-hydrogen.$3.$ Stephen reaction is the reduction of nitriles to aldehydes using $SnCl_2/HCl$.

Which of the following reactions involve the carbon-carbon bond formation?

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