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1 International Organizations MCQs
Assistant Director - PESSI

When did Pakistan join the Southeast Asia Treaty Organization (SEATO)?

  • 1954
  • 1955
  • 1956
  • 1957
0 Comments
Correct Answer: A. 1954

Explanation:

Pakistan joined the Southeast Asia Treaty Organization (SEATO) in 1954. SEATO was established on September ... Read More Details

2 MS Office MCQs
Assistant Director - PESSI

Autocorrect is used to replace ___ words in a document?

  • Misused
  • Misspelled
  • Complicated
  • Abbreviated
0 Comments
Correct Answer: B. Misspelled

Explanation:

Autocorrect is a built-in feature in word processing software like Microsoft Word, Google Docs, and ... Read More Details

3 Organic Chemistry MCQs

When benzene is substituted by halogens, which halogen gets position 1 in naming the compound?

  • Bromine
  • Chlorine
  • Fluorine
  • Iodine
0 Comments
Correct Answer: C. Fluorine

Explanation:

In organic chemistry, when more than one halogen atom is attached to a ... Read More Details

4 Organic Chemistry MCQs

Benzene was discovered by Michael Faraday during the destructive distillation of vegetable oil in the ?

  • Presence of oxygen
  • Presence of hydrogen
  • Absence of oxygen
  • Presence of excessive oxygen
0 Comments
Correct Answer: C. Absence of oxygen

Explanation:

Benzene (C₆H₆) was discovered by Michael Faraday in 1825 during his experiments on ... Read More Details

5 Organic Chemistry MCQs

How many moles of hydrogen gas (H₂) react with benzene in the presence of a platinum catalyst?

  • 2
  • 3
  • 4
  • 6
0 Comments
Correct Answer: B. 3

Explanation:

Benzene (C₆H₆) is an aromatic compound with six carbon atoms connected in a ... Read More Details

6 Organic Chemistry MCQs

What is the resonance energy of benzene?

  • 150.5 kJ/mol
  • 250.5 kJ/mol
  • 150.5 cal/mol
  • 250.5 cal/mol
0 Comments
Correct Answer: A. 150.5 kJ/mol

Explanation:

Benzene (C₆H₆) is an aromatic compound with a unique stability that cannot be ... Read More Details

7 Organic Chemistry MCQs

Which catalyst is used to prepare benzene from acetylene at 70°C?

  • Cr₂O₃ + Al₂O₃ + SiO₂
  • Raney nickel
  • Organo-nickel
  • Ni (250–300°C)
0 Comments
Correct Answer: C. Organo-nickel

Explanation:

Benzene can be synthesized from acetylene (ethyne) by a process known as trimerization, ... Read More Details

8 Organic Chemistry MCQs

Which method does not give benzene?

  • Sodium benzoate + soda lime
  • Phenol + Zn dust
  • Chlorobenzene + NaOH (360°C, 150 atm)
  • Benzene sulfonic acid + steam
0 Comments
Correct Answer: C. Chlorobenzene + NaOH (360°C, 150 atm)

Explanation:

Several chemical methods are used to prepare benzene from different organic compounds. Understanding ... Read More Details

9 Organic Chemistry MCQs

When bromine reacts with benzene in the presence of sunlight, what will happen?

  • The benzene ring will break
  • Substitution reaction will occur
  • Addition reaction will occur
  • No reaction will occur
0 Comments
Correct Answer: C. Addition reaction will occur

Explanation:

Benzene (C₆H₆) is an aromatic compound that generally undergoes electrophilic substitution reactions rather ... Read More Details

10 Organic Chemistry MCQs

During the sulfonation of benzene, concentrated H₂SO₄ generates which electrophile?

  • HSO₄⁻
  • SO₂
  • SO₃
  • H⁺
0 Comments
Correct Answer: B. SO₂

Explanation:

Sulfonation of benzene is an example of an electrophilic aromatic substitution (EAS) reaction ... Read More Details