Chemistry Chapter 17 Entry Test MCQs
Topic 17
Preparation
1. Ketones are prepared by the oxidation of:
a. Secondary alcohols
b. Primary alcohols
c. Tertiary alcohols
d. All of these
2. The oxidation of iso-propyl alcohol in the presence of acidify K2Cr2O7 gives
a. Propane
b. Propanal
c. Butanone
d. Propanone
3. Formalin is
a. 20% solution of formaldehyde in water
b. 10% solution of formaldehyde in water
c. 60% solution of formaldehyde in water
d. 40% solution of formaldehyde in water
4. The catalyst used for the laboratory preparation of formaldehyde is
a. Pt-asbestos
b. Cd-asbestos
c. Cu-asbestos
d. Pb-asbestos
5. The structure and hybridization of carbonyl carbon in alkanal and alkanone is
a. Linear and sp3
b. Trigonal and sp3
c. Planar and sp2
d. Linear and sp2
6. Among the following, _ is NOT a structural derivative of water
a. Ethers
b. Alcohols
c. Aldehydes
d. Phenols
7. Which one of the following is also known as the lactic acid?
a. 2-Hydroxy propanoic acid
b. 3-Hydroxy propanoic acid
c. 3-hydroxy butanoic acid
d. 2-hydroxy butanoic acid
8. Water gas heated at 450°C and 200 atm pressure in the presence of ZnO+Cr2O3 will produce
a. Carbonic acid
b. Methanal
c. Methane
d. Methanol
9. What is the compound called if remaining two valencies of a carbonyl group are satisfied by two alkyl groups.
a. Acid
b. Aldehyde
c. Acid chloride
d. Ketone
10. Which of the following is a mixed ketone
a. Benzophenone
b. Pentanone
c. Butanone
d. Acetophenone
Base Catalyzed + Acid Catalyzed
11. The increasing order of the rate of HCN addition to compounds A – D is
(A) HCHO (B) CH3COCH3 (C) PhCOCH3 (D) PhCOPh
a. D < C < B < A
b. A < B < C < D
c. C < D < B < A
d. D < B < C < A
12. Reaction of acetaldehyde with HCN followed by hydrolysis gives a compound which shows
a. Metamerism
b. Optical isomerism
c. Tautomerism
d. Geometrical isomerism
13. When a mixture of methane and oxygen is passed through heated molybdenum oxide, the main product formed is
a. Methanol
b. Methanoic acid
c. Methanal
d. Ethanal
14. Benzyl alcohol and sodium benzoate is obtained by the action of sodium hydroxide on benzaldehyde. This reaction is known as
a. Sandmeyer’s reaction
b. Perkin’s reaction
c. Claisen condensation
d. Cannizzaro’s reaction
15. Crotonaldehyde is an α,β-unsaturated aldehyde formed from an aldol. The aldehyde which is the starting material in this reaction is:
a. Propanal
b. Ethanal
c. Propanol
d. Propanone
16. How many structural isomers with molecular formula C4H8O can reduce Tollen’s reagent to form a silver mirror:
a. Two
b. One
c. Four
d. Three
17. An organic compound A when treated with NaBH4 forms B, which is used in denaturing of the spirit. The compound A is:
a. Methanol
b. Ethanol
c. Ethanal
d. Methanal
18. Which of the following show no reactivity with hydroxylamine:
a. CH3CHO
b. HCHO
c. (CH3)2CO
d. CH3OH
19. Which of the following are used to protect the carbonyl functional group?
a. Ethanol
b. Ammonia
c. Ether
d. Water
20. The reaction of an aldehyde with hydroxylamine gives a product which is called
a. Semicarbazone
b. Aminohydroxide
c. Oxime
d. Hydrazone
21. The product of the reaction between ammonia and acetaldehyde is
a. Paraformaldehyde
b. Urotropine
c. ethanamine
d. ethanimine
22. Which of the following correctly describes the bond angle and hybridizations present in formaldehyde?
a. C, sp2; O, sp2; HCO, ~109.5o
b. C, sp3; O, sp2; HCO, ~109.5o
c. C, sp2; O, sp3; HCO, ~120o
d. C, sp2, O, sp2; HCO, ~120o
23. C2H5CHO and CH3COCH3 can be distinguished from one another by testing with:
a. phenylhydrazine
b. sodium bisulphate
c. Aldol condensation
d. Fehling’s solution
24. Benzaldehyde and acetaldehyde can be differentiated by
a. Hydrazine
b. HCN
c. NaOH solution
d. NH2OH
25. Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid
a. Phenol
b. Butanal
c. Benzoic acid
d. Benzaldehyde