1. The molecular formula of toluene is
A. C7H7
B. C7H8
C. C8H8
D. C8H7
✅ The correct answer is option B.
Aromatic Hydrocarbons MCQs
2. In benzene sulphonic acid the sulphonic group is attached with benzene ring through
A. Hydrogen
B. Oxygen
C. Sulphur
D. -OH
✅ The correct answer is option C.
3. Phenanthrene is a fused polycyclic compound contains ______ benzene rings
A. 2
B. 3
C. 4
D. 5
✅ The correct answer is option B.
4. Aniline is a derivative of benzene which contains
A. Imino group
B. Amino group
C. Amide group
D. Nitro group
✅ The correct answer is option B.
5. How many electrons are there in benzene to form the delocalized electronic cloud
A. 3
B. 4
C. 6
D. 8
✅ The correct answer is option C.
6. Nitration of chlorobenzene gives
A. o – chloronitrobenzene
B. p – chloronitrobenzene
C. m – chloronitrobenzene
D. A & B
✅ The correct answer is option D.
7. When two or more different substituents are attached with a benzene ring the number 1 position in the ring is given to a high priority group. Which one of the following groups has the highest – priority?
A. #REF!
B. -CHO
C. -COOH
D. -CN
✅ The correct answer is option C.
8. When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of the compound?
A. Bromine
B. Chlorine
C. Fluorine
D. Iodine
✅ The correct answer is option D.
9. Which one of the following is not a meta directing group?
A. -CN
B. -OH
C. -COOH
D. -CHO
✅ The correct answer is option B.
10. Which pair of groups contains both ortho & para directing groups
A. OH -RCO
B. NR3 -CN
C. OCH3 -CHO
D. N (CH3)2 -NH2
✅ The correct answer is option D.