Question

Chemistry AS level help please what does di substituted mean

Answer 1

The definition of disubstituted is having two substituent atoms or groups in a molecule

Answer 2

These definitions are the preferred ones to be used in Organic Chemistry. Note that some terms (such as configuration) have more than one interpretation.

acid: an agent able to produce positively charged hydrogen ions (H+). [Since the hydrogen ion is a bare proton, it usually exists in a solvated form (such as H3O+).]

achiral: not chiral. A compound (or object) that is superimposible on its mirror image. For example CH4.

activation energy: the miminmum energy which reacting species must possess in order to be able to form an 'activated complex', or 'transition state', before proceeding to the products. [The activation energy (Ea) may be derived from the temperature dependence of the reaction rate using the Arrhenius equation.]

addition reactions: reactions in which an unsaturated system is saturated or part saturated by the addition of a molecule across the multiple bond.[E.g. the addition of bromine to ethene to form 1,2-dibromoethane]

alkaloid: organic substances occurring naturally, which are basic, forming salts with acids. The basic group is usually an amino function.

allyl group: a group containing 3 carbon atoms and a double bond [C1=C2-C3, where C3 is called the allyliuc position or allylic carbon atom].

allylic rearrangement: the migration of a double bond in a 3-carbon system from carbon atoms one and two to carbon atoms two and three,

e.g. C1=C2-C3-X X-C1-C2=C3