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Topic 10: Organic Chemistry
25. Isomers: Recalling concept facts and definition
1. Two isomers must have the same
1) Percent composition 3) Physical properties
2) Arrangement of atoms 4) Chemical properties
2. Compounds that have the same molecular formula , but different molecular structures are called
1) Isotopes 3) Isomers
2) Allotropes
4) Electrovalent
3. 2-methyl butane and 2,2-dimethyl propane are isomers. Molecules of these two compounds have
different
1) Molecular formulas 3) Structural formulas
2) Number of carbon
4) Number of covalent bonds
Teacher Preview Copy
4. The compounds CH3OCH3 and CH3CH2OH are isomers because they have
3) Different molecular formula
1) Same molecular formula
2) Same structural formula 4) Different percentage composition
5. What is the minimum number of carbon atoms a hydrocarbon must have in other to have an isomer?
1) 1 2) 2 3) 3 4) 4
6. As the number of carbon atoms in each successive member of a homologous series of hydrocarbon
series increases, the number of possible isomers 3) Remains the same
2) Decreases
1) Increases
26. Isomers: Determining compound with most or least number of isomers
1. An alkene compound of which molecular formula will have the most number of isomers?
1) C2H4 Teacher Preview Copy 4) C5H10
2) C3H6
3) C4H8
2. Which alkane compound will have the most number of isomers?
1) C7H16 2) C6H14 3) C5H12 4) C4H10
3. Which hydrocarbon molecular formula will have the least number of isomers? 4) C7H12
3) C6H10
2) C4H6
1) C5H8
4. Which compound has no isomer? 3) C2H5Cl 4)C5H11Cl
1) C3H7Cl
2) C4H9Cl
27. Isomers: Recognizing formulas that are isomers
1. The compound C4H9OH is an isomer of
1) C3H7COCH3 2) C2H5OC2H5 3) C3COOC2H5 4) CH3COOH
2. Which compound is an isomer of butanoic acid, CH3CH2CH2COOH ?
1) CH3CH2CH2CH2OH 2) CH3CH2CH2CH2COOH 3) CH3CH2COOCH3 4) CH3CH2OCH3
3. Which two condensed formulas are isomers of each other?
1) CH3CH2CH(Cl)CH3 and CH3CH(Cl)CH2CH3 3) CH3CH2CH3 and CH2CHCH3
2) CH2CH2 and CH3COCH3
4) CH3CH(OH)CH3 and CH3CH(OH)CH2CH3
4. Which IUPAC name is an isomer of 3-hexene?
1) 2-methyl hexene 2) 2-hexene 3) 3-heptene 4) 2-heptyne
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 309
Topic 10: Organic Chemistry
25. Isomers: Recalling concept facts and definition
1. Two isomers must have the same
1) Percent composition 3) Physical properties
2) Arrangement of atoms 4) Chemical properties
2. Compounds that have the same molecular formula , but different molecular structures are called
1) Isotopes 3) Isomers
2) Allotropes
4) Electrovalent
3. 2-methyl butane and 2,2-dimethyl propane are isomers. Molecules of these two compounds have
different
1) Molecular formulas 3) Structural formulas
2) Number of carbon
4) Number of covalent bonds
Teacher Preview Copy
4. The compounds CH3OCH3 and CH3CH2OH are isomers because they have
3) Different molecular formula
1) Same molecular formula
2) Same structural formula 4) Different percentage composition
5. What is the minimum number of carbon atoms a hydrocarbon must have in other to have an isomer?
1) 1 2) 2 3) 3 4) 4
6. As the number of carbon atoms in each successive member of a homologous series of hydrocarbon
series increases, the number of possible isomers 3) Remains the same
2) Decreases
1) Increases
26. Isomers: Determining compound with most or least number of isomers
1. An alkene compound of which molecular formula will have the most number of isomers?
1) C2H4 Teacher Preview Copy 4) C5H10
2) C3H6
3) C4H8
2. Which alkane compound will have the most number of isomers?
1) C7H16 2) C6H14 3) C5H12 4) C4H10
3. Which hydrocarbon molecular formula will have the least number of isomers? 4) C7H12
3) C6H10
2) C4H6
1) C5H8
4. Which compound has no isomer? 3) C2H5Cl 4)C5H11Cl
1) C3H7Cl
2) C4H9Cl
27. Isomers: Recognizing formulas that are isomers
1. The compound C4H9OH is an isomer of
1) C3H7COCH3 2) C2H5OC2H5 3) C3COOC2H5 4) CH3COOH
2. Which compound is an isomer of butanoic acid, CH3CH2CH2COOH ?
1) CH3CH2CH2CH2OH 2) CH3CH2CH2CH2COOH 3) CH3CH2COOCH3 4) CH3CH2OCH3
3. Which two condensed formulas are isomers of each other?
1) CH3CH2CH(Cl)CH3 and CH3CH(Cl)CH2CH3 3) CH3CH2CH3 and CH2CHCH3
2) CH2CH2 and CH3COCH3
4) CH3CH(OH)CH3 and CH3CH(OH)CH2CH3
4. Which IUPAC name is an isomer of 3-hexene?
1) 2-methyl hexene 2) 2-hexene 3) 3-heptene 4) 2-heptyne
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 309
