Q1 · medium · AI-verified
How many sigma (σ) bonds and pi (π) bonds are present in one molecule of ethyne (acetylene, C₂H₂)?
- 3 sigma bonds and 2 pi bonds
- 4 sigma bonds and 1 pi bond
- 5 sigma bonds and 2 pi bonds
- 2 sigma bonds and 3 pi bonds
Q2 · medium · AI-verified
In Markovnikov's rule, during addition of HX to an unsymmetrical alkene, the hydrogen atom adds to the carbon that:
- Is more electronegative
- Has more hydrogen atoms already attached
- Has more carbon substituents only
- Has fewer hydrogen atoms already attached
Q3 · medium · AI-verified
The process of converting vegetable oils into solid fats (vanaspati) involves which chemical reaction?
- Saponification
- Halogenation
- Esterification
- Catalytic hydrogenation
Q4 · medium · AI-verified
Which reagent is used to distinguish between an aldehyde and a ketone in Tollens' test?
- Bromine water
- Fehling's solution (Cu²⁺ complex)
- Ammoniacal silver nitrate solution (Ag(NH₃)₂⁺)
- Potassium permanganate (KMnO₄)
Q5 · medium · AI-verified
The number of sigma (σ) bonds present in a molecule of ethyne (acetylene, C₂H₂) is:
- 4
- 2
- 5
- 3