Chemistry Class 11 NCERT Solutions: Chapter 12 Organic Chemistry Some Basic Principles and Techniques Part 8 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q: 15. What is the relationship between the members of following pairs of structures? Are they structural or geometrical isomers or resonance contributors?

(A)

Q_15_A_Relationship between the Members of Following Pairs O …

(B)

Q_15_B_Relationship between the Members of Following Pairs O …

(C)

Q_15_C_Relationship between the Members of Following Pairs O …

Answer:

(A) Compounds having the same molecular formula but with different structures are called structural isomers. The given compounds have the same molecular formula but they differ in the position of the functional group (ketone group) .

Q_15_Ans_A_Structure of Pair Represents Structural Isomers

In structure I, ketone group is at the of the parent chain (hexane chain) and in structure II, ketone group is at the of the parent chain (hexane chain) . Hence, the given pair represents structural isomers.

(B) Compounds having the same molecular formula, the same constitution, and the sequence of covalent bonds, but with different relative position of their atoms in space are called geometrical isomers.

Q_15_Ans_B_Structure of Pair Represents Geometrical Isomers

In structures I and II, the relative position of Deuterium (D) and hydrogen (H) in space are different. Hence, the given pairs represent geometrical isomers.

(C) The given structures are canonical structures or contributing structures. They are hypothetical and individually do not represent any real molecule. Hence, the given pair represents resonance structures, called resonance isomers.

Q_15_Ans_C_Structure of Pair Represents Resonanc Isomers

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