1. What is the correct IUPAC name for the compound CH3-CH(CH3)-CH2-CH3?
(A) 3-Methylbutane
(B) 2-Methylbutane
(C) Pentane
(D) Isopentane
✅ Answer: (B) 2-Methylbutane
2. What is the IUPAC name for the compound with the structure C(CH3)4?
(A) Neo-pentane
(B) Tetramethylmethane
(C) 2,2-Dimethylpropane
(D) 2-Methylbutane
✅ Answer: (C) 2,2-Dimethylpropane
3. The correct structural formula for the 'iso-propyl' group is:
(A) CH3-CH2-CH2-
(B) (CH3)3C-
(C) (CH3)2CH-
(D) CH3-CH(CH2)-
✅ Answer: (C) (CH3)2CH-
4. What is the correct IUPAC name for CH3-CH(C2H5)-CH2-CH(CH3)-CH3?
(A) 2-Methyl-4-ethylpentane
(B) 4-Ethyl-2-methylpentane
(C) 3-Ethyl-5-methylhexane
(D) 3,5-Dimethylheptane
✅ Answer: (C) 3-Ethyl-5-methylhexane
5. The IUPAC name of the compound CH3-C(CH3)2-CH2-CH3 is:
(A) 2,2-Dimethylbutane
(B) 2-Methyl-2-ethylpropane
(C) 3,3-Dimethylbutane
(D) Neo-hexane
✅ Answer: (A) 2,2-Dimethylbutane
6. The structural formula for the 'tert-butyl' group is:
(A) (CH3)2CH-CH2-
(B) (CH3)3C-
(C) CH3-CH2-CH(CH3)-
(D) CH3-CH2-C(CH3)2-
✅ Answer: (B) (CH3)3C-
7. How many total carbon atoms are in 4-Ethyl-3-methylheptane?
✅ Answer: (D) 10
8. Which of the following names is correct according to the IUPAC system?
(A) 2-Methyl-3-ethylbutane
(B) 2-Ethyl-2-methylbutane
(C) 3-Methylpentane
(D) 2,2-Dimethyl-3-ethylpropane
✅ Answer: (C) 3-Methylpentane
9. What is the general formula for Alkanes?
(A) CnH2n
(B) CnH2n+2
(C) CnH2n-2
(D) CnHn
✅ Answer: (B) CnH2n+2
10. Selecting the longest carbon chain is which rule of IUPAC nomenclature?
(A) Lowest Locant Rule
(B) Parent Chain Rule
(C) Alphabetical Order Rule
(D) None of the above
✅ Answer: (B) Parent Chain Rule
11. The IUPAC name of CH2=CH-CH2-CH3 is:
(A) But-2-ene
(B) But-1-ene
(C) 1-Butylene
(D) 2-Butylene
✅ Answer: (B) But-1-ene
12. The IUPAC name of CH3-CH=C(CH3)2 is:
(A) 2-Methylbut-2-ene
(B) 3-Methylbut-2-ene
(C) 2-Methylbut-3-ene
(D) 1,1-Dimethylprop-1-ene
✅ Answer: (A) 2-Methylbut-2-ene
13. The IUPAC name of CH≡C-CH2-CH3 is:
(A) But-1-yne
(B) But-2-yne
(C) 1-Butyne
(D) Both (A) and (C)
✅ Answer: (A) But-1-yne
14. The correct IUPAC name for CH2=CH-CH=CH2 is:
(A) 1,3-Dibutene
(B) Buta-1,3-diene
(C) But-1,3-diene
(D) Divinyl
✅ Answer: (B) Buta-1,3-diene
15. The 'Vinyl' group is:
(A) CH2=CH-
(B) CH2=CH-CH2-
(C) CH3-CH=
(D) CH≡C-
✅ Answer: (A) CH2=CH-
16. The IUPAC name of CH3-CH(CH3)-CH=CH2 is:
(A) 2-Methylbut-3-ene
(B) 3-Methylbut-1-ene
(C) 2-Methylbut-1-ene
(D) Isopentene
✅ Answer: (B) 3-Methylbut-1-ene
17. What is the IUPAC name of CH≡C-CH=CH2?
(A) But-1-yn-3-ene
(B) But-1-en-3-yne
(C) Pent-1-en-3-yne
(D) Pent-1-yn-3-ene
✅ Answer: (B) But-1-en-3-yne
18. The 'Allyl' group is:
(A) CH2=CH-
(B) CH2=CH-CH2-
(C) CH3-CH=CH-
(D) CH≡C-CH2-
✅ Answer: (B) CH2=CH-CH2-
19. The IUPAC name of CH3-C≡C-CH(CH3)2 is:
(A) 2-Methylpent-3-yne
(B) 4-Methylpent-2-yne
(C) 2-Methylpent-2-yne
(D) 4-Methylpent-3-yne
✅ Answer: (B) 4-Methylpent-2-yne
20. What is the general formula for Alkynes?
(A) CnH2n
(B) CnH2n+2
(C) CnH2n-2
(D) CnHn
✅ Answer: (C) CnH2n-2
21. How many sigma (σ) and pi (π) bonds are in Benzene?
(A) 6 σ, 3 π
(B) 9 σ, 3 π
(C) 12 σ, 3 π
(D) 3 σ, 3 π
✅ Answer: (C) 12 σ, 3 π
22. What is the molecular formula of Cyclohexane?
(A) C6H6
(B) C6H10
(C) C6H12
(D) C6H14
✅ Answer: (C) C6H12
23. The correct IUPAC name for Methylcyclopentane is:
(A) 1-Methylcyclopentane
(B) Methylcyclopentane
(C) 2-Methylcyclopentane
(D) None of the above
✅ Answer: (B) Methylcyclopentane
24. Where does numbering begin in Cyclohexene?
(A) From any carbon
(B) From the carbon with the substituent
(C) From the carbons of the double bond
(D) From the lowest numbered carbon
✅ Answer: (C) From the carbons of the double bond
25. What is the common name for 1,2-Dimethylbenzene?
(A) p-Xylene
(B) m-Xylene
(C) o-Xylene
(D) Toluene
✅ Answer: (C) o-Xylene
26. The IUPAC name of CH3-CH2-OH is:
(A) Ethane
(B) Ethanol
(C) Ethyl alcohol
(D) Methanol
✅ Answer: (B) Ethanol
27. The IUPAC name of CH3-CH(Cl)-CH3 is:
(A) 1-Chloropropane
(B) Isopropyl chloride
(C) 2-Chloropropane
(D) 3-Chloropropane
✅ Answer: (C) 2-Chloropropane
28. The IUPAC name of CH3-O-CH3 is:
(A) Dimethyl ether
(B) Methoxymethane
(C) Ethanol
(D) Methane
✅ Answer: (B) Methoxymethane
29. The IUPAC name of CH3-CH(OH)-CH2-CH3 is:
(A) Butan-1-ol
(B) Butan-3-ol
(C) Butan-2-ol
(D) 2-Ethyl ethanol
✅ Answer: (C) Butan-2-ol
30. Which suffix is used for the Alcohol functional group?
(A) -ene
(B) -ol
(C) -al
(D) -one
✅ Answer: (B) -ol
31. The IUPAC name of CH2=CH-CH2-OH is:
(A) Prop-1-en-3-ol
(B) Prop-2-en-1-ol
(C) 1-Hydroxyprop-2-ene
(D) Allyl alcohol
✅ Answer: (B) Prop-2-en-1-ol
32. The IUPAC name of CH3-O-CH2-CH3 is:
(A) Methoxyethane
(B) Ethoxymethane
(C) Ethyl methyl ether
(D) Both (A) and (C)
✅ Answer: (A) Methoxyethane
33. What is a benzene ring with an -OH group attached called?
(A) Benzenol
(B) Phenol
(C) Phenyl alcohol
(D) Both (A) and (B)
✅ Answer: (D) Both (A) and (B)
34. The correct IUPAC name for Br-CH2-CH(OH)-CH3 is:
(A) 1-Bromopropan-2-ol
(B) 2-Hydroxy-3-bromopropane
(C) 3-Bromopropan-2-ol
(D) 2-Bromopropan-1-ol
✅ Answer: (A) 1-Bromopropan-2-ol
35. What is a benzene ring with an -NH2 group attached called?
(A) Aniline
(B) Benzenamine
(C) Aminobenzene
(D) All of the above
✅ Answer: (D) All of the above
36. The IUPAC name of HCHO is:
(A) Formaldehyde
(B) Methanol
(C) Methanal
(D) Acetaldehyde
✅ Answer: (C) Methanal
37. The IUPAC name of CH3-CHO is:
(A) Methanal
(B) Ethanol
(C) Acetaldehyde
(D) Ethanal
✅ Answer: (D) Ethanal
38. Which suffix is used for the Ketone functional group?
(A) -ol
(B) -al
(C) -one
(D) -oic acid
✅ Answer: (C) -one
39. The IUPAC name of CH3-CO-CH3 is:
(A) Propanal
(B) Propan-2-one
(C) Propan-1-one
(D) Acetone
✅ Answer: (B) Propan-2-one
40. The IUPAC name of CH3-CH2-CO-CH3 is:
(A) Butan-2-one
(B) Butan-3-one
(C) Pentanone
(D) Ethyl methyl ketone
✅ Answer: (A) Butan-2-one
41. The IUPAC name of HCOOH is:
(A) Formic acid
(B) Methanal
(C) Methanoic acid
(D) Both (A) and (C)
✅ Answer: (D) Both (A) and (C)
42. The IUPAC name of CH3-COOH is:
(A) Ethanoic acid
(B) Acetic acid
(C) Methane carboxylic acid
(D) Both (A) and (B)
✅ Answer: (D) Both (A) and (B)
43. Which suffix is used for the Aldehyde functional group?
(A) -ol
(B) -al
(C) -one
(D) -oic acid
✅ Answer: (B) -al
44. The correct IUPAC name for CH3-CH(CHO)-CH2-COOH is:
(A) 3-Aldo butanoic acid
(B) 3-Formylbutanoic acid
(C) 2-Formylbutan-4-oic acid
(D) 1-Hydroxy-1,3-butanedial
✅ Answer: (B) 3-Formylbutanoic acid
45. The IUPAC name of CH3-CO-CH2-CH2-COOH is:
(A) 4-Oxopentanoic acid
(B) 2-Oxopentanoic acid
(C) 1-Carboxybutan-3-one
(D) 3-Ketopentanoic acid
✅ Answer: (A) 4-Oxopentanoic acid
46. What is a benzene ring with a -CH3 group attached called?
(A) Xylene
(B) Cresol
(C) Toluene
(D) Phenyl methane
✅ Answer: (C) Toluene
47. What is a benzene ring with an -NO2 group attached called?
(A) Nitrobenzene
(B) Phenyl nitrite
(C) Aniline
(D) Nitrotoluene
✅ Answer: (A) Nitrobenzene
48. The IUPAC name of CH3-CH(NH2)-COOH is:
(A) 2-Aminopropanoic acid
(B) 1-Aminoethanoic acid
(C) 2-Carboxypropane
(D) Alanine
✅ Answer: (A) 2-Aminopropanoic acid
49. The IUPAC name of CH3-CN is:
(A) Ethanenitrile
(B) Methyl cyanide
(C) Aminomethane
(D) Cyanomethane
✅ Answer: (A) Ethanenitrile
50. In the priority order of functional groups, which is given the highest priority?
(A) Alcohol (-OH)
(B) Aldehyde (-CHO)
(C) Ketone (-CO-)
(D) Carboxylic acid (-COOH)
✅ Answer: (D) Carboxylic acid (-COOH)
