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Solved Example: Isomerism
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Page 1 JEE Solved Example on Isomerism JEE Mains Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain. (A) I (B) II (C) III (D) IV Ans: (B) All groups are as far apart as possible. Q2: The IUPAC name of the compound: (A) ( ???? , ???? , ???? )-octa-2,4,6-triene (B) ( ???? , ???? , ???? )-octa-2,4,6-triene (C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene (D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene Page 2 JEE Solved Example on Isomerism JEE Mains Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain. (A) I (B) II (C) III (D) IV Ans: (B) All groups are as far apart as possible. Q2: The IUPAC name of the compound: (A) ( ???? , ???? , ???? )-octa-2,4,6-triene (B) ( ???? , ???? , ???? )-octa-2,4,6-triene (C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene (D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene Q3: How many spatial orientations are possible in the following compound? (A) 2 (B) 4 (C) 6 (D) 8 Ans: (D) 3-stereo centers and no POS in any compound ? Stereo isomers = 2 3 = 8 Q4: How are compounds I and II are related? (A) Enantiomers (B) Diastereomers (C) Constitutional (D) Identical Ans: (C) Compounds are (C) constitutional isomers Page 3 JEE Solved Example on Isomerism JEE Mains Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain. (A) I (B) II (C) III (D) IV Ans: (B) All groups are as far apart as possible. Q2: The IUPAC name of the compound: (A) ( ???? , ???? , ???? )-octa-2,4,6-triene (B) ( ???? , ???? , ???? )-octa-2,4,6-triene (C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene (D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene Q3: How many spatial orientations are possible in the following compound? (A) 2 (B) 4 (C) 6 (D) 8 Ans: (D) 3-stereo centers and no POS in any compound ? Stereo isomers = 2 3 = 8 Q4: How are compounds I and II are related? (A) Enantiomers (B) Diastereomers (C) Constitutional (D) Identical Ans: (C) Compounds are (C) constitutional isomers Q5: The non identical species are: Sol 5: (B) Page 4 JEE Solved Example on Isomerism JEE Mains Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain. (A) I (B) II (C) III (D) IV Ans: (B) All groups are as far apart as possible. Q2: The IUPAC name of the compound: (A) ( ???? , ???? , ???? )-octa-2,4,6-triene (B) ( ???? , ???? , ???? )-octa-2,4,6-triene (C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene (D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene Q3: How many spatial orientations are possible in the following compound? (A) 2 (B) 4 (C) 6 (D) 8 Ans: (D) 3-stereo centers and no POS in any compound ? Stereo isomers = 2 3 = 8 Q4: How are compounds I and II are related? (A) Enantiomers (B) Diastereomers (C) Constitutional (D) Identical Ans: (C) Compounds are (C) constitutional isomers Q5: The non identical species are: Sol 5: (B) Q6: Which statement is correct about the following structures Ans: (C) I and II are enantiomers as they are nonsuperimposable mirror image of each other. I, II and are all structural isomer as they have same molecular formula. Page 5 JEE Solved Example on Isomerism JEE Mains Q.1 In which of the following has minimum torsional strain and minimum Vander waal strain. (A) I (B) II (C) III (D) IV Ans: (B) All groups are as far apart as possible. Q2: The IUPAC name of the compound: (A) ( ???? , ???? , ???? )-octa-2,4,6-triene (B) ( ???? , ???? , ???? )-octa-2,4,6-triene (C) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene (D) ( ?? ?? , ?? ?? , ?? ?? )-octa-2,4,6-triene Ans: (C) ( 2 ?? , 4 ?? , 6 ?? )-octa-2,4,6-triene Q3: How many spatial orientations are possible in the following compound? (A) 2 (B) 4 (C) 6 (D) 8 Ans: (D) 3-stereo centers and no POS in any compound ? Stereo isomers = 2 3 = 8 Q4: How are compounds I and II are related? (A) Enantiomers (B) Diastereomers (C) Constitutional (D) Identical Ans: (C) Compounds are (C) constitutional isomers Q5: The non identical species are: Sol 5: (B) Q6: Which statement is correct about the following structures Ans: (C) I and II are enantiomers as they are nonsuperimposable mirror image of each other. I, II and are all structural isomer as they have same molecular formula. Q7: Which will form geometrical isomers? Ans: (D) As form of ring is also formed. Ans (D) Q8: If optical rotation produced by (A) is +36o then optical rotation produced by (B) will be ? (A) + ???? ° (B) ?? ° (C) + ???? ° (D) UnpredictableRead More
FAQs on Solved Example: Isomerism
| 1. What is isomerism? |  |
Ans. Isomerism is a phenomenon in which two or more compounds have the same molecular formula but different structural arrangements, leading to different chemical and physical properties.
| 2. How many types of isomerism are there? | |
Ans. There are two main types of isomerism: structural isomerism, where the atoms are arranged in a different order, and stereoisomerism, where the spatial arrangement of atoms differs.
| 3. Can you give an example of structural isomerism? | |
Ans. An example of structural isomerism is the compounds butane and isobutane, which have the same molecular formula (C4H10) but different structures.
| 4. What is the significance of isomerism in chemistry? | |
Ans. Isomerism is significant in chemistry as it helps in understanding the relationship between the structure of a compound and its properties, reactivity, and behavior in various chemical reactions.
| 5. How can one distinguish between different types of isomers? | |
Ans. Different types of isomers can be distinguished by analyzing their structural formulas, physical properties, and behavior in chemical reactions. Techniques like spectroscopy and chromatography can also be used for identification.
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