Question

Compounds having the same composition but different structural formulas :

• A. are used for substitution products
• B. are called isomers
• C. are called polymers
• D. have the same properties
• E. are usually alkanes

Answer 1

Answer: (B)

are called isomers

Compounds having the same composition but different structural formulas are called isomers.
Even though isomers have same molecular formula, the atoms are linked in different manner resulting in different structures.
Thus, isomers are different compounds having same molecular formula and have different physical and chemical properties.
For example, n-butane $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_3$ and isobutane $C{H}_{3}CH\left(C{H}_3\right)C{H}_3$ are isomers with same molecular formula $C_4{H}_{10}$