Explanation

Percentage yield = (Actual yield / Theoretical yield) × 100  

= (20 / 25) × 100 = 80%

Explanation

- The sideways overlap of unhybridized p-orbitals forms pi bonds.  

- In propene, the double bond consists of one sigma bond (from sp² orbitals) and one pi bond (from p-orbitals).

Explanation

- Phenol is more acidic than alcohols.  

- When phenol loses an H⁺, the resulting phenoxide ion is resonance-stabilized, making ionization favorable.  

- Alcohols lack this stabilization, so they don't react with weak bases like NaOH.

Explanation

- Carboxylic acid + NH₃ → Ammonium carboxylate (salt)  

- On heating, this ammonium salt loses water and forms an amide.

Reaction:  

R–COOH + NH₃ → R–COO⁻ NH₄⁺ → (heat) → R–CONH₂ + H₂O

Explanation

Explanation

- Ionization energy decreases down a group and increases across a period.  

- Among the given elements, Barium is in Group 2 and near the bottom of the periodic table, meaning its outer electrons are farthest from the nucleus and easiest to remove.

So, Ba has the lowest ionization energy

Explanation

In crystallography:

- α = angle between b and c  

- β = angle between a and c  

- γ = angle between a and b

So, β is the angle between axes a and c, or equivalently, between the faces perpendicular to those axes.

Explanation

- Benzene is an aromatic compound, which undergoes electrophilic substitution (not addition) to preserve its aromaticity.  

- FeCl₃ acts as a Lewis acid, helping generate the chloronium ion (Cl⁺) — the electrophile.

Reaction type:  

Benzene + Cl₂ (in FeCl₃) → Chlorobenzene + HCl

Explanation

- Atomic number of Boron (B) = 5  

- Electron configuration = 1s² 2s² 2p¹  

- The 2p orbital has 1 electron, which is unpaired

So, Boron has 1 unpaired electron in its ground state.

Explanation

Structure of (CH₃)₃CCH₂Br:

- Central carbon bonded to three CH₃ (methyl) groups → 2,2-dimethyl  

- A CH₂Br group is attached to the central carbon at position 1 → 1-bromo

So, the IUPAC name is:  

1-bromo-2,2-dimethylpropane