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Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q.
how many structural isomers (aldehyde + ketone) are possible for C5H10O ?
- a)3
- b)4
- c)6
- d)7
Correct answer is option 'D'. Can you explain this answer?
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Understanding Structural Isomers of C5H10O
To determine the number of structural isomers for the molecular formula C5H10O, we need to consider both aldehydes and ketones.
Types of Isomers
- Aldehydes: They are characterized by the presence of the carbonyl group (C=O) at the end of the carbon chain.
- Ketones: They feature the carbonyl group within the carbon chain.
Possible Aldehyde Isomers
1. Pentanal: A straight-chain aldehyde (C1-C5).
2. 2-Methylbutanal: One methyl group on the second carbon.
3. 3-Methylbutanal: One methyl group on the third carbon.
Total aldehyde isomers = 3
Possible Ketone Isomers
1. 2-Pentanone: Carbonyl group on the second carbon.
2. 3-Pentanone: Carbonyl group on the third carbon.
3. 4-Methyl-2-pentanone: A methyl group on the second carbon and carbonyl on the same carbon.
4. 3-Methyl-2-butanone: Methyl group on the third carbon and carbonyl on the second carbon.
Total ketone isomers = 4
Total Structural Isomers
- Aldehydes: 3
- Ketones: 4
Final Count
Adding both types of isomers gives us:
3 (aldehydes) + 4 (ketones) = 7 structural isomers.
Thus, the correct answer is option 'D' with a total of 7 structural isomers for C5H10O.
To determine the number of structural isomers for the molecular formula C5H10O, we need to consider both aldehydes and ketones.
Types of Isomers
- Aldehydes: They are characterized by the presence of the carbonyl group (C=O) at the end of the carbon chain.
- Ketones: They feature the carbonyl group within the carbon chain.
Possible Aldehyde Isomers
1. Pentanal: A straight-chain aldehyde (C1-C5).
2. 2-Methylbutanal: One methyl group on the second carbon.
3. 3-Methylbutanal: One methyl group on the third carbon.
Total aldehyde isomers = 3
Possible Ketone Isomers
1. 2-Pentanone: Carbonyl group on the second carbon.
2. 3-Pentanone: Carbonyl group on the third carbon.
3. 4-Methyl-2-pentanone: A methyl group on the second carbon and carbonyl on the same carbon.
4. 3-Methyl-2-butanone: Methyl group on the third carbon and carbonyl on the second carbon.
Total ketone isomers = 4
Total Structural Isomers
- Aldehydes: 3
- Ketones: 4
Final Count
Adding both types of isomers gives us:
3 (aldehydes) + 4 (ketones) = 7 structural isomers.
Thus, the correct answer is option 'D' with a total of 7 structural isomers for C5H10O.
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