Aldehyde ketones & carboxylic Acid MCQs for NEET — Chemistry Questions with Answers

(b) $3\left({\mathrm{CH}}_3\mathrm{CHO}\right)\underset{\mathrm{Dil}. {\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{\mathrm{Conc}. {\mathrm{H}}_2{\mathrm{SO}}_4}{\rightleftharpoons }}({\mathrm{CH}}_3\mathrm{CHO}{)}_3$

(a) $(C{H}_3{)}_2$CHCHO shows both reactions, i.e., aldol condensation and Cannizzaro's reaction

(c) CH₃CHO$\stackrel{{\mathrm{PCl}}_5}{\to }$CH₃CHl₂

(b) R$—$CN$\stackrel{{\mathrm{SnCl}}_2+\mathrm{HCl}}{\to }$RCHO+NH₄Cl+SnCl₄

(c) Ketones shows condensation only.

(b) Tischenko's reaction is a modified Cannizzaro's reaction given by all aldehydes, 2RCHO$\underset{∆}{\overset{\mathrm{Al}({\mathrm{OC}}_2{\mathrm{H}}_5{)}_3}{\to }}$ RCOOH+RCH₂OH$\to$RCOOH₂R

(c) HCHO is gas at room temperature. Its aqueous solution called formalin (42% HCHO+8% CH₃OH) is used as preservative for biological specimens.

(b) Glucose reduces Fehling's solution.

Acetals are diethers derived from aldehydes or ketones by the addition of two molecules of alcohol with the elimination of one molecule of water. They are formed by reacting an aldehyde or ketone with an alcohol in the presence of an acid catalyst.

(b) (CH₃)₂CHOH $\stackrel{\left[\mathrm{O}\right]}{\to }$(CH₃)₂CO