Concept of the Day

๐Ÿงช The Markovnikov’s Rule

$CH_3-CH=CH_2 + HBr$ $ \longrightarrow CH_3-CH(Br)-CH_3$

The Rule: In the addition of a protic acid ($HX$) to an asymmetric alkene, the acid hydrogen ($H$) attaches to the carbon with the greater number of hydrogen atoms, while the halide ($X$) group attaches to the carbon with the greater number of alkyl substituents.

"The rich get richer."

Note: Essential for solving reaction mechanisms in Class 12, JEE, and NEET Prep.

Concept of the Day Archive

ICAS English – Year 4 Structure (Reading Comprehension Focus)

 ICAS English – Reading Comprehension paper for Grade 4 (Year 4, Australia):


๐Ÿ“˜ ICAS English – Year 4 Structure (Reading Comprehension Focus)

Total duration: ~45 minutes
Number of questions: ~35–40
Question type: Multiple Choice Only
Skills tested: Reading comprehension, vocabulary, interpretation, inference, sequencing, and text analysis.


๐Ÿงฑ Paper Layout

The paper consists of a series of reading passages, followed by multiple-choice questions. Passages may include:

  1. Narratives / Short Stories

    • Fictional texts with characters, plot, and setting.

    • Questions test character motivation, sequence of events, and cause-effect relationships.

  2. Poetry

    • Short poems with simple rhyme and rhythm.

    • Questions test tone, mood, imagery, and language use.

  3. Factual Texts / Informational Reports

    • E.g., a report on animals, places, science, history.

    • Questions test main idea, specific details, and text structure.

  4. Procedural Texts

    • Instructions, recipes, “how to” guides.

    • Questions test following steps, understanding sequence, and purpose.

  5. Persuasive Texts

    • Letters to the editor, advertisements, opinion pieces.

    • Questions test author’s purpose, point of view, and persuasive techniques.

  6. Diagrams / Visual Texts

    • May include posters, maps, or signs.

    • Questions test ability to extract information from visuals.


๐Ÿ” Question Styles

Skill Tested Example of What Is Asked
Literal Comprehension "What did the boy do first?"
Inference "Why did the girl decide to return home?"
Vocabulary in Context "What does the word 'startled' mean in this context?"
Main Idea / Purpose "What is the main purpose of this text?"
Sequencing / Ordering "Which happened last in the story?"
Interpretation of Tone "How is the author feeling about this event?"

๐ŸŽฏ Marking and Difficulty

  • No negative marking.

  • Questions increase in difficulty as the test progresses.

  • Some texts are challenging intentionally to test higher-order thinking.


๐Ÿ“ Sample Layout of the Paper

Section Content Type Approx. No. of Qs
1 Short Story / Narrative 8–10
2 Factual Passage 6–8
3 Poem or Rhymed Text 4–6
4 Procedure / Visual 4–5
5 Persuasive / Opinion 6–8