M6S1 – Carbonyls

Carbonyls

1 / 10

Which of these compounds are functional group isomers?

(i) CH₃CHCHOH

(ii) CH₃CH₂CHO

(iii) CH₃COCH₃

(iv) CH₃CH₂COCH₃

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

The hydride ion, H^-, is:

(i) a reducing agent

(ii) a nucleophile

(iii) a base

(iv) a free radical

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Reagents which can be used in a test-tube test to distinguish aldehydes from ketones are:

(i) Tollen's reagent

(ii) 2,4-dinitrophenylhydrazine

(iii) Fehling's solution

(iv) sulfuric acid

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

A compound P, C₄H₈O, gave on oxidation an acid C₄H₈O₂. Which of the following are possible structures for P?

(i)CH₃CH₂CH₂CHO

(ii)CH₃COCH₂CH₃

(iii) (CH₃)₂CHCHO

(iv) CH₃CH=CHCH₂OH

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

A sample of propan-2-ol was heated under reflux with an acidified, aqueous solution of potassium dichromate(VI). The resulting mixture was then distilled. The distillate contained:

(i) propanoic acid

(ii) propanone

(iii) propanal

(iv) water

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 10

Which of these aldehydes are isomers of pentan-2-one?

(i) pentanal

(ii) 2-methylbutanal

(iii) 3-methylbutanal

(iv) 2,2-dimethylbutanal

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

7 / 10

The reaction of propanone with HCN in the presence of some KCN is an example of:

electrophilic substitution

nucleophilic substitution

electrophilic addition

nucleophilic addition

8 / 10

Treating ethanal with hydrogen cyanide in the presence of some KCN and then hydrolysing the product with hot hydrochloric acid (which converts a cyano / nitrile group RCN, to RCOOH) produces:

HO-CH₂-CH₂-CO₂H

HO₂C-CH₂-CH₂-CO₂H

CH₃-CHOH-CO₂H

CH₂=CH-CO₂H

9 / 10

Which reagent converts butan-2-one to butan-2-ol?

NaBH₄

HCN followed by HCl_(aq)

Cr₂O₇^2- and acid

Fehling's solution (an alternative to Tollen’s but this is a blue soln to brick red ppt colour change)

10 / 10

Which types of alcohol, when heated under reflux with acidified potassium dichromate(VI), turn the colour of the solution from orange to green?

primary only

secondary only

tertiary only

primary and secondary

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