The phenomenon of existence of two or more compounds possessing the same molecular formula, but different properties is known as isomerism. Such compounds are called as isomers.

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What is isomer?

Important Questions on Basic Principles of Organic Chemistry

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

The maximum number of cyclic isomers (positional and optical) of a compound having molecular formula

C_{3} H_{2} C l_{2}

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

Which of the following pairs of compounds are positional isomers?

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

Among

(i) {[C r {(e n)}_{3}]}^{3 +}, (i i) t r a n s - {[C r {(e n)}_{2} C l_{2}]}^{+}, (i i i) C i s - {[C r {(e n)}_{2} C l_{2}]}^{+}, (i v) {[C o {(N H_{3})}_{4} C l_{2}]}^{+}

the optically active complexes are

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

The maximum number of isomeric ethers with the molecular formula

C_{4} H_{10} O

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

What is isomerism? Write the names and structural formulas of the isomers of pentane.

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

The correct corresponding order of names of four aldoses with configuration given below respectively, is

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

The optically inactive compound from the following is:

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

Number of constitutional isomers of alkane with formula

C_{6} H_{14}

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

The structure of two organic compounds are given below:

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(a) Write the molecular formula of these compounds.
(b) Which type of isomerism do they exhibit?
(c) Explain the isomerism.
(d) Write the position isomer of butanol.

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

Which of the following compounds will exhibit geometrical isomerism?

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

(+) 2-Methylbutan-1-ol and (-) 2- Methylbutan-1-ol have different values for which property?

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

A special name is assigned to compounds having the same molecular formula, but the different structural arrangement of atoms. What is that name?

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Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Isomerism

The number of isomers which are ether and having the molecular formula