The hydrocarbon C₄H₁₀ is named: MCQ with Answer and Explanation

Explanation:
Bohr's model successfully explains the spectrum of hydrogen and hydrogen-like species (single electron systems like He⁺, Li²⁺). However, it fails to explain the spectra of multi-electron atoms due to electron-electron repulsions and cannot account for the splitting of spectral lines in magnetic (Zeeman) and electric (Stark) fields.

Explanation:
2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O. Carbon dioxide is released, which turns limewater milky. This is a test for bicarbonates. Oxygen is not produced; hydrogen would need a reducing agent.

Explanation:
Nylon-6,6 is a condensation polymer formed by reaction between hexamethylenediamine and adipic acid, with elimination of water molecules. Polythene, Teflon, and PVC are addition polymers where monomers add without loss of small molecules. Condensation polymers often have amide or ester linkages. Another example is polyester (terylene). Nylon is a polyamide, known for strength and elasticity.