Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [methyl…

Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [methyl alcohol, ethyl alcohol, paired, one, Cannizzaro, d-d, salicylaldehyde, Perkin’s, unpaired, f-f, salicylic acid, Kolbe’s, two, 193000, 96500, Reimer-Tiemann] Formaldehyde reacts with conc. alkali to give sodium formate and _________ due to the absence of $\alpha$ - hydrogen atom. The reaction is known as _________ reaction.