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Bihar Board Class 12 (Science) Aldehydes Ketones — practice questions

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Tollens' reagent gives a silver mirror with:The IUPAC name of the simplest aldehyde, $\mathrm{HCHO}$, isThe carbonyl carbon in an aldehyde or ketone isWhich carboxylic acid has the highest $K_a$ (i.e. is the most acidic)?The reaction of formaldehyde with concentrated NaOH is called