12th class (Fsc) Chemistry unit 12 MCQs
chapter 12 MCQs 12th Class Chemistry
Aldehydes and Ketones:
1. Organic compounds containing >C=O functional group are called:
a. Ethers
b. Carbonyl compounds
c. Alcohol
d. Cannizaro’s compounds
2. The general formula of aldehydes and ketones is:
a. CnH2n-1O
b. CnH2+1
c. CnH2nO2
d. CnH2nO
3. The functional group for the aldehyde is:
a. -CHO
b. R-X
c. -COOR
d. >C-O-C<
4. The general formula of homogenous series of both the aldehyde and ketones:
a. CnH2n2
b. CnH2n
c. CnH2n-2
d. CnH2nO
5. At room temperature most of the aldehyde and ketones are:
a. Solids
b. Volatile
c. Non volatile
d. None of these
6. which one of the following is called methanol:
a. CH3CHO
b. H-CHO
c. C6H5CHO
d. CH3CH2
7. In writing the IUPAC names of a ketone the ending e of the name of alkane having the same number of C-atoms is replaced by:
a. One
b. al
c. Oic acid
d. ol
8. The IUPAC name of CH3CH2CH(CI)-CHO is:
a. 2-chlorobutanol
b. 2-chlorobutanal
c. 2- chlorobutanoic acid
d. 2- chlorobutyraldehyde
9. The common name of CH3-CHO is:
a. Acetaldehyde
b. Ethanol
c. Formaldehyde
d. Ethanal
10. The homologous series of both aldehydes and ketones have:
a. No general formula
b. Same general formula
c. Different general formula
d. None of the given
11. Which one of the following compound is not the component of formation?
a. Methanol
b. Ethyl alcohol
c. water
d. Formaldehyde
12. What is percentage of water in formation?
a. 42%
b. 22%
c. 52%
d. 40%
13. What is %age of formaldehyde in formation?
a. 20%
b. 30%
c. 10%
d. 40%
14. What is the %age of methyl alcohol in formation?
a. 6%
b. 8%
c. 10%
d. 12%
15. Which one of the following is not used as a catalyst for oxidation of methanol?
a. Nickel
b. Copper
c. Platinzied asbestos
d. Silver
16. The conversion of ethylene in the presence of pdcI2 and CuCI2 into a
acetaldehyde involves which one of the following process?
a. Hydrogenation
b. Hydration
c. Dehydration
d. Oxidation
17. The carbon atom of a carbonyl group is:
a. sp2 hybridized
b. sp hybridized
c. None of these
d. sp3 hybridized
18. Which one of the following will have the highest boiling point?
a. Propanal
b. Mathanal
c. 2-Hexanone
d. Ethanal
19. Aldehydes are prepared from:
a. 1oalcohols
b. 2oalcohols
c. 3oalcohols
d. Both a and c
20. Ketones are prepared from:
a. 2oalcohols
b. 3oalcohols
c. None of given
d. 1oalcohols
21. HCN adds to aldehydes and ketones to give:
a. Cyanohydrides
b. Cyanohydrins
c. Cyanonitriles
d. Cyanohy droxides
22. Which one of the following reacts with sodium bisulphite solution to form a white ppt?
a. Aldehydes
b. Small methyl ketone
c. Both a and b
d. None of these
23. A molecule containing both aldehyde as well as alcohol functional groups is called:
a. Ketol
b. Aldol
c. Carbonyl
d. None of these
24. Aldol condensation occurs between:
a. An aldehyde and a ketone
b. Two aldehydes
c. Two ketones
d. All of these
25. Aldol product on heating undergoes:
a. Rearrangements
b. Decomposition
c. None of these
d. Dehydration