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12th Grade > Chemistry

ISOMERISM MCQs

Total Questions : 30 | Page 1 of 3 pages
Question 1. Compounds with same molecular formula but different structural formula are
  1.    Isomers
  2.    Isotopes
  3.    Isobars
  4.    Isoelectronic
 Discuss Question
Answer: Option A. -> Isomers
:
A
Compounds with same molecular formula but different structural formula are called isomers. This is the definition of isomers.
Question 2. Which of the following can exhibit cis-trans isomerism?
  1.    HC≡CH
  2.    ClCH=CHCl
  3.    CH3CHCl−COOH
  4.    ClCH2−CH2Cl
 Discuss Question
Answer: Option B. -> ClCH=CHCl
:
B
Which Of The Following Can Exhibit Cis-trans Isomerism?
Only compounds with a double bond and atleast 2 different substituents on either side can exhibit cis-trans isomerism.
Question 3. Which of the following is not found in alkenes?
  1.    Chain isomerism
  2.    Geometrical isomerism
  3.    Metamerism
  4.    Position isomerism
 Discuss Question
Answer: Option C. -> Metamerism
:
C
Metamerism is shown only by secondary amines, ethers and ketones.
Themetamerismarises when different alkyl groups are attached to same functional group.
Question 4.  In the presence of AlCl3/HCl n-butane isomerizes to:
  1.    Cyclobutane
  2.    2-Butene
  3.    Isobutane
  4.    1-Butene
 Discuss Question
Answer: Option C. -> Isobutane
:
C
 In The Presence Of AlCl3/HCl N-butane Isomerizes To:
The remaining compounds are unsaturated and are not formed.
Question 5. An isomer of ethanol is: 
  1.    methanol 
  2.    diethyl ether
  3.    acetone
  4.    dimethyl ether
 Discuss Question
Answer: Option D. -> dimethyl ether
:
D
Isomers have same molecular formula but differ in their structures or in spatial arrangement.
CompoundStructuralMolecularformulaEthanolC2H5OHC2H6OMethanolCH3OHCH4ODiethyletherC2H5OC2H5C4H10ODimethyletherCH3OCH3C2H6O
Question 6. The hydrocarbon containing a continuous chain which is isomeric with 2-methyl-3-ethylhexane is?
  1.    Hexane
  2.    Octane
  3.    Nonane
  4.    Decane
 Discuss Question
Answer: Option C. -> Nonane
:
C
Structure of 2-methyl-3-ethylhexane is C|CH3H3C2H5|CHCHCB2CH2CH3
It contains 9 carbon atoms.
So, a 9 carbon straight chain can be made which is nonane.
Question 7. Number of isomers of molecular formula C2H2Br2 are?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option C. -> 3
:
C
C2H2Br2 has 3 isomers
Number Of Isomers Of Molecular Formula  C2H2Br2 Are?
Question 8. Isomers have essentially identical ___
  1.    Structural formula
  2.    Chemical properties
  3.    Molecular formula
  4.    Physical properties
 Discuss Question
Answer: Option C. -> Molecular formula
:
C
The compounds which have the same molecular formula but differ in arrangement of atoms in a molecule are called isomers.
Question 9. A functional isomer of ethanol is?
  1.    Methanol
  2.    Diethyl ether
  3.    Ethylene glycol
  4.    Dimethyl ether
 Discuss Question
Answer: Option D. -> Dimethyl ether
:
D
Dimethyl ether would be the functional isomer of ethanol. Both have the molecular formula of C2H6O but one is an ether and the other is an alcohol.
Functional isomers are the ones with same molecular formula but different functional group.
Question 10. The compound with molecular formula \(C_4H_{10}O\) exhibits:
  1.    Metamerism
  2.    Functional isomerism
  3.    Position isomerism
  4.    All
 Discuss Question
Answer: Option D. -> All
:
D
CH3CH2OCH2CH3andCH3OCH2CH3metamersCH3CH2CH2CH2CH2OHandCH3CH2OCH2CH3functionalisomers
CH3CH2CH2CH2OHandCH3CH2CHOHCH3

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