Compound which posses same molecular formula but differ in each other in the structure of carbon chain is ?

Two or more compounds are called structural isomers if they possess the same molecular formula but different structural formulas.  

Explanation:

Two compounds are considered structural isomers if their molecular formulas are the same while they differ in their structural formulas.

For example, the molecular formula represents both butane and methylpropane. However, the two compounds differ in their structural formula. (See the structural formulas in the diagram attached.)

Due to the difference in the structures of structural isomers, there's a good chance that they will show different chemical and physical properties. For example, the melting point of butane is higher than that of methylpropane. The straight-chain shape of butane allows its molecules to be stacked close to each other. That allows for greater intermolecular forces and, therefore, a higher melting point.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-