Chemistry MCQs for NEET — Practice Questions with Answers

(b) Benedicts solution contains CuSO₄, sodium citrate and sodium carbonate.

(b) Unlike KMnO₄ acid Jone's reagent (K₂Cr₂O₇ + H₂SO₄) does not attack C=C.

(b) ${\mathrm{CH}}_3\mathrm{CHO}\stackrel{{\left({\mathrm{C}}_2{\mathrm{H}}_5\mathrm{O}\right)}_3\mathrm{Al}}{\to }{\mathrm{CH}}_3{\mathrm{COOCH}}_2.{\mathrm{CH}}_3$

This is Tischenko's reaction.

(c) Semicarbazide is NH₂NHCONH₂.

(c) These are characteristics of C₆H₅CHO.

(a) ${\mathrm{CH}}_3{\mathrm{CHOHCH}}_2\mathrm{CHO}$ is aldol.

The given reaction sequence involves the formation of a tertiary alcohol from the ketone upon reaction with EtMgBr and subsequent dehydration to give a trisubstituted alkene. Ozonolysis of this alkene produces diethyl ketone and acetaldehyde, indicating that the original ketone was diethyl ketone.

Propionaldehyde, upon treatment with dilute NaOH, undergoes aldol condensation, forming a β-hydroxy aldehyde. The product formed is 4-hydroxy-2-methylhexanal, with the given structure.

(b) ${\mathrm{CCl}}_3\mathrm{CHO}\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }{\mathrm{CCl}}_3\mathrm{CH}(\mathrm{OH}{)}_2$

                             Chloral hydrate