Pyridine (C₅H₅N)

A basic heterocyclic organic compound; a colourless, pungent toxic liquid.

Hydrogen peroxide (H₂O₂)

The compound of hydrogen and oxygen. Colourless, odourless liquid; heavier than water.

Dimethylamine (NH(CH₃)₂)

A colourless gas with a pungent odour. It is widely used in industry.

Ethene (ethylene) (C₂H₄)

The first member in the homologous series of 1-alkenes.

Cis-2-butene (C₄H₈)

A colourless, heavier-than-air gas. Its geometric isomer is trans-2-butene.

Ozone (O₃)

An allotrope of oxygen, consisting of 3 oxygen atoms.

Ethyne (acetylene) (C₂H₂)

The first member of the homologous series of alkyne hydrocarbons.

Nitrogen-dioxide (NO₂)

A reddish-brown toxic gas, very reactive due to its unpaired electron.

Hydrogen sulphide (H₂S)

A colourless, toxic gas with the characteristic odour of rotten eggs. It occurs in certain mineral waters and spring waters.

Phosphoric acid (H₃PO₄)

It is also used as a food additive, limescale and rust remover.

Aniline (C₆H₅NH₂)

The simplest aromatic amine. Its scientific name is phenylamine.

Hydrogen bromide (HBr)

One of the hydrogen halides, it is used for the production of alkyl bromides.

Sulphur trioxide (SO₃)

One of the oxides of sulphur, forms sulphuric acid with water.

Hexane (C₆H₁₄)

The sixth member in the homologous series of straight-chain alkanes.

2-deoxy-beta-D-ribose (C₅H₁₀O₄)

A component of DNA, it contains one less hydroxyl group than β-D-ribose.

Butane (C₄H₁₀)

The fourth member in the homologous series of alkanes.

Fluorine (F₂)

The lightest halogen, a pale yellow-green, toxic gas, extremely reactive. Its best known compound is teflon.

Beta-D-ribose (C₅H₁₀O₅)

A crystalline compound found in nucleic acids, coenzymes, nucleotides and nucleosides.

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