Free Isomerism MCQs with Answers

• A. Optical isomerism
• B. Geometric isomerism
• C. Both A and B
• D. None of these

Explanation: 2-Pentene shows geometric isomerism. As it has a double bond, and both carbons have a different group attached to them.

• A. 2
• B. 3
• C. 4
• D. 5

Explanation: There should be minimum 3 carbon atoms in a compound to show position isomerism.

• A. Structural Isomerism
• B. Stereo Isomerism
• C. Geometrical Isomerism
• D. Optical Isomerism

Explanation: The restricted rotation of an atom or groups around the doubly bonded carbon gives different geometries of a compound.Such compounds are…

• A. Must contain at least four carbon atoms.
• B. When in solution rotate the plane of polarized light to the left.
• C. Must always contain asymmetric carbon atom.
• D. In solution always give a negative reading in polarimeter.

Explanation: If the compound consists of more than one carbon and contained at least one chiral carbon, it will make the compound optically active.

• A. 2
• B. 3
• C. 4
• D. 6

Explanation: Option A is correct as only 2 isomers are possible for Chloropropane. These structural isomers are 1- Chloropropane and 2- Chloropropane.

• A. 7
• B. 6
• C. 5
• D. 4

Explanation: Hexane (C6H14) has five possible isomers. The isomers are as follows;- Hexane, CH3CH2CH2CH2CH2CH3, a six carbon containing, saturated…

• A. 1 and 2
• B. 2 and 3
• C. 1 only
• D. All 1, 2 and 3

Explanation: The explanation for this question will be added soon.

• A. Positional isomerism
• B. Geometrical isomerism
• C. Cis-trans isomerism
• D. Functional group isomerism

Explanation: Alkynes can exhibit positional isomerism where the position of the triple bond changes within the carbon chain.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: For geometric isomerism to be possible two adjacent carbon atoms must have two different groups attached to them which is only in the case…

• A. 4
• B. 3
• C. 2
• D. 1

Explanation: CH4 is a hydrocarbon molecule consisting of four carbon atom. It can exist in only two structural isomers: The two isomers of C4H10 differ…

• A. Reforming
• B. Isomerism
• C. Polymorphism
• D. Hybridization

Explanation: Compounds that have the same molecular formula but different chemical structures are called isomers and phenomenon is called…

• A. Methane
• B. Ethane
• C. Propane
• D. Butane

Explanation: d) ButaneButane (C4H10) is a hydrocarbon consisting of four carbon atoms and ten hydrogen atoms.

• A. Amino acids
• B. Ketones
• C. Carboxylic acids
• D. All of these options are correct

Explanation: Tautomerism is when a carbon-carbon double bond is shifted to another atom.

• A. 2
• B. 4
• C. 6
• D. 5

Explanation: Butane has two isomers. The two chain isomers of butane (C4H10) are n-butane and isobutane. Hence, A is the correct option

• A. Electron
• B. Carbon atom
• C. Functional group
• D. H-atom

Explanation: Option A is wrong because tautomerism doesn't involve the transfer of electrons. It involves the transfer of hydrogen atoms.

• A. Two
• B. Four
• C. Three
• D. Five

Explanation: Pentane has 'three isomers': n-pentane, iso-pentane, and neo-pentane.

• A. Butane
• B. Butanone
• C. Butene
• D. Butyne

Explanation: Butane is the first hydrocarbon for which branching is possible, and it has the formula C4H10, hence the simplest compound out of all the…

• A. Tautomerism
• B. Metamerism
• C. Geometrical isomerism
• D. Position isomerism

Explanation: b) Metamerism: Metamerism is a type of isomerism where two or more compounds have the same molecular formula but differ in the arrangement…

• A. Reforming
• B. Isomerism
• C. Polymorphism
• D. Hybridization

Explanation: Isomerism is the existence of molecules that have the same numbers of the same kinds of atoms (and hence the same formula) but differ in…

• A. Metamerism
• B. Functional group
• C. Chain
• D. Position

Explanation: CH3-O-CH3 exhibits functional group isomerism. The compounds having the same molecular formula but different functional groups are said to…