Chemistry : Aldehydes, Ketones and Carboxylic Acids

Reaction of formaldehyde and ammonia gives

• hexamethylene tetramine

• bakelite

• urea

• triethylene tetramine

Which of the following compounds is not formed in iodoform reaction of acetone?

• CH₃COCH₂I

• ICH₂COCH₂I

• CH₃COCHI₂

• CH₃COCI₃

A compound (A) C₄H₈Cl₂ on alkaline hydrolysis to give compound (B) C₄H₈O which gives an oxime and positive Tollen's reagent test. What is the structure of (A)?

• CH₃CH₂CH₂CHCl₂

• CH₃CCl₂CH₂CH₃

• CH₃CH(Cl)CH(Cl)CH₃

• CH₂ClCH₂CH₂CH₂Cl

Which of the following is highly acidic in nature?

In the reaction,

CH₃-CH₂-Cl $\stackrel{\mathrm{KCN}}{\to }$ (A) $\stackrel{\mathrm{Complete} \mathrm{hydrolysis}}{\to }$(B), end product (B) is

• CH₃ - CH₂ - CN

• CH₃ - CH₂ - CONH₂

• CH₃ - CH₂ - COOH

• CH₃ - CH₂ - CH₂ - CH₂ - CN

A colourless water soluble organic liquid decomposes sodium carbonate and liberates CO₂. It produces black ppt with Tollen's reagent. The liquid is

• acetaldehyde

• acetamide

• formic acid

• acetone

Order of ease of decarboxylation of the following acids is

(i) CH₃COOH

(ii) CH₂=CH-CH₂.COOH

(iii) CH₂(COOH)₂

(iv) 

• i > ii > iii > iv

• iii > iv > ii > i

• iv > iii > ii > i

• i > iii > ii > iv

The final product of the following sequence of reaction is

CH₂=CH₂ $\underset{{\mathrm{CCl}}_4}{\overset{{\mathrm{Br}}_2}{\to }}$ (A) $\stackrel{\mathrm{KCN}}{\to }$ (B) $\stackrel{{\mathrm{H}}^{+} / {\mathrm{H}}_2\mathrm{O}}{\to }$ (C)

The enol form of acetone, after treatment with D₂O gives

In keto-enol tautomerism of dicarbonyl compounds, the enol-form is preferred in contrast to the keto-form, this is due to

• presence of carbonyl group on each side of -CH₂ group

• resonance stabilisation of enol form

• presence of methylene group

• rapid chemical exchange