Sunday, November 24, 2013

MCQ’S Based on : Aldehydes, Ketones and Haloalkanes


MCQ’S Based on : Aldehydes, Ketones and Haloalkanes
Q01. The general molecular formula of aldehydes and ketones is
1) CnH2n-1.O
2) CnH2nO
3) CnH2n+2O
4) CnH2n+4O
Q02. Aldehyde functional group can occur
1) Any where in the carbon chain
2) In the middle of the carbon chain
3) Only at the second carbon atom
4) only at either end carbon atom of the chain
Q03. Propan-2-ol on treatment with copper at 3000c forms
1) Acetone
2) Acetaldehyde
3) Ethane
4) Both 1 and 2
Q04. Which of the following is correct?
1) Aldehydes undergo Cannizzaro’s reaction
2) Aldehydes are less susceptible to oxidation than ketones
3) Aldehydes are more susceptible to oxidation than ketones
4) Formaldehyde forms CuO with Fehling’s solution
Q05. IUPAC name of CH3CHOHCH2CHO is
1) 2-hydroxybutanal
2) 2-hydroxypropanal
3) 3-hydroxybutanal
4) b-hydroxybutanal
Q06. The reagent which can be used to distinguish acetophenone from benzophenone is
1) 2, 4-dinitrophenyl hydrazine
2) Benedict’s solution
3) Tollen’s reagent
4) I2 and Na2CO3
Q07. Toluene on reacting with chromyl chloride gives:
1) Chlorotoluene
2) Benzyl chloride
3) Benzaldehyde
4) Benzoic acid
Q08. Mesitylene is prepared from
1) CH3CHO and conc. HNO3
2) CH3COCH3 and conc. H2SO4
3) CH3COCH3 and conc. HCl
4) CH3CHO and conc. H2SO4
Q09. (CH3)2C = CHCOCH3 can be oxidised to (CH3)2C = CHCOOH by
1) Chromic acid
2) NaOI
3) Cu at 3000c
4) KMNO4
Q10. Oppenaur oxidation is the reverse process of
1) Wolff –Kishner reduction
2) Rosenmund’s reduction
3) Clemmensen reduction
4) Meerwein-Pondorf-Verely reduction
Q11. In the reaction CH3CHO + CH2(COOH)2      ----------pyridine/heat ------->A.  The compound A is
1) CH3COOH
2) C2H5COOH
3) CH3CH = CHCOOH
4) COOHCH = CHCOOH
Q12. Benzaldehyde reacts with alcoholic KCN to give:
1) C6H5CH(OH)CN
2) C6H5CH(OH)COC6H5
3) C6H5CH(OH)COOH
4) C6H5CH(OH)CH(OH)C6H5
Q13. Aldehydes and ketones do not react with
1) sodium bisulphite
2) phenyl hydrazine
3) semi carbazide
4) di hydrazine sodium phosphate
Q14. Which of the following will undergo aldol condensation?
1) CH2=CHCHO
2) CH=CCHO
3) C6H5CHO
4) CH3CH2CHO
Q15. Which type of isomerism is shown by the pentanone
1) Chain isomerism
2) Position isomerism
3) Functional isomerism
4) All 1, 2 and 3
Q16. Paraldehyde is formed as a result of polymerisation of
1) CH3CHO
2) HCHO
3) CH3OH
4) CH3CH2CHO
Q17. Aromatic aldehydes in the presence of CN-  ion give acyloins. The reaction is known as
1) Perkin reaction
2) Benzoin condensation
3) Claisen condensation
4) Cannizzaro’s reaction
Q18. Which of the following method is used to convert ketone into hydrocarbon
1) aldol condensation
2) Reimer Tieman reaction
3) Cannizzaro’s reaction
4) Clemmensen’s reduction
Q19. Which will not give formaldehyde on heating or upon distillation?
1) Formalin
2) Trioxane
3) Paraldehyde 4) Paraformaldehyde

Q20. When ethanal is heated with Fehling’s solution it gives a precipitate of
1) Cu
2) CuO
3) Cu2O
4) CuO+Cu2O+Cu
Q21. When CH3CHBrCH2CH3 is reacted with alcoholic KOH the major product is
1) CH3CH=CHCH3
2) CH2=CHCH2CH3
3) CH3CH(OH)CH2CH3
4) CH3CH2CH2CH3
Q22. Benzene reacts with n-propyl chloride in the presence of anhydrous AlCl3 to give
1) 3-propyl-1-chlorobenzene
2) n-propyl benzene
3) No action
4) Isopropyl benzene
Q23. Identify Z in the following series:
CH2=CH2  -----HBr--->    X   ------Hydrolysis ----> Y    -----I2 / excess NaOH ----> Z
1) C2H5I
2) C2H5OH
3) CHI3
4) CH3CHO
Q24. Bromoethane reacts with silver nitrite to form
1) Nitroethane
2) Ethane
3) Ethylnitrite
4) Nitroethane and ethylnitrite
Q25. Which of the following compounds on oxidation gives benzoic acid?
1) o-Chlorophenol
2) p-Chlorotoluene
3) Chlorobenzene
4) Benzyl chloride
Q26. Reaction between alkyl halide and sodium metal is called
1) Wurtz reaction
2) Kolbe’s reaction
3) Clemmensen’s reaction
4) Wurtz - Fittig’s reaction
Q27. Which compound gives iodoform by reaction between I2 and NaOH?
1) CH3OH
2) C2H5OH
3) C3H7OH
4) C2H5OC2H5
Q28. The reactivity order of halides in dehydrohalogenation reaction is:
1) R-F > R-Cl > R-Br > R-I
2) R-I > R-Br > R-Cl > R-F
3) R-I >R-Cl > R-Br > R-F
4) R-F > R-I > R-Br > R-Cl
Q29. Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?
1) ethyl chloride
2) isopropyl chloride
3) chlorobenzene
4) benzyl chloride
Q30. SN2 mechanism proceeds through intervention of:
1) carbocation
2) transition state
3) free radical
4) carbanion
ANSWERS

Q 01     2
Q 11     3
Q 21     1
Q 02     4
Q 12     2
Q 22     4
Q03      1
Q 13     4
Q 23     3
Q 04     3
Q 14     4
Q 24     4
Q 05     3
Q 15     4
Q 25     4
Q 06     4
Q 16     1
Q 26     1
Q 07     3
Q 17     2
Q 27     2
Q 08     2
Q 18     4
Q 28     2
Q 09     2
Q 19     3
Q 29     4
Q 10     4
Q 20     3
Q 30     2

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