similar genera are grouped into a

When a molecule contains more than one similar functional groups, then, the word di (for 2), tri (for 3), etc., is added before the secondary suffix, of the functional group. While adding such words, the vowel 'e' of primary suffix is retained. For example: ..

In some cases Mendeleev placed elements according to their similarities in properties and not in increasing order of their atomic masses, while some dissimilar elements were grouped together. Thus, the position of these elements was not justified. For example, cobalt (at. mass ..

Aromatic hydrocarbons are called arenes. When one or more hydrogens are removed from the aromatic hydrocarbons, the residues left behind are termed as aryl groups (similar to alkyl groups in the case of aliphatic hydrocarbons). The aryl groups are represente..

When an atom or group of atoms bonded to a carbon atom in the chain or ring of an organic compound, shown some characteristic properties of their own, they are termed as a functional group. Thus, a functional group is an atom or group of atoms which determine..

Due to diagonal relationship existing between beryllium and aluminium, they both show some similarities. Both Be and Al form covalent compounds. On treatment with concentrated HNO 3 , both beryllium and aluminium are rendered passive. Both form complexes. BeO and Al 2 O 3 are amphoteric i..

The members of a certain group possess similar properties but the reactivity may differ, e.g., in case of group I A the reactivity increases as we move down the group from lithium to cesium but in case of VII A it decreases from fluorine to iodin..

General Characteristics of Group - 1. Valence shell electrons On moving down the group the valence shell electrons remain the same. 2. Valency The valency of all the members of a particular group is same. 3. Properties of elements The members of a certain group..

Structures of Functional Groups Present in Carboxylic Acid Derivatives - The structure of the functional groups in acyl halide, acid anhydride, ester and amide are similar to that of the carboxyl group. Due to the presence of lone pairs of electrons at the ha..

Group 17 of the periodic table contains the elements fluorine, chlorine, bromine, iodine and astatine. These elements are collectively known as the HALOGENS. This name is derived from two Greek words Halo and Gens meaning 'salt producing'. Halogens are among the most reactive non-metals. ..

The structure of the functional groups in acyl halide, acid anhydride, ester and amide are similar to that of the carboxyl group. Due to the presence of lone pairs of electrons at the halogen, oxygen and nitrogen atoms, resonance is possible in these derivatives just l..