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Among the following structures I to IV :...

Among the following structures I to IV :-
`C_2 H_5-overset(CH_3)overset("|")(CH)-C_3H_7`
(ii) `CH_3-overset("O")overset("||")(C)-overset(CH_3)overset("|")(CH)-C_2H_5`
(iii) `H-underset(H)underset("|")overset(H)overset("|")(C)`
(iv) `C_2 H_5-overset(CH_3)overset("|")(CH)-C_2H_5`

A

All four are chiral compounds

B

Only (I) and (II) are chiral compounds

C

Only (III) is a chiral compound

D

Only (II) and (IV) are chiral compounds

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given structures are chiral compounds, we need to analyze each structure based on the definition of chirality. A carbon atom is considered chiral if it is bonded to four different groups and does not have a double or triple bond. ### Step-by-Step Solution: 1. **Analyze Structure I: `C_2 H_5-overset(CH_3)overset("|")(CH)-C_3H_7`** - Identify the chiral carbon: The carbon attached to `C_2H_5`, `CH_3`, `C_3H_7`, and `H` is chiral because all four groups are different. - Conclusion: **Structure I is chiral.** 2. **Analyze Structure II: `CH_3-overset("O")overset("||")(C)-overset(CH_3)overset("|")(CH)-C_2H_5`** - Identify the chiral carbon: The carbon attached to `CH_3`, `C_2H_5`, `O`, and a carbonyl (C=O) is chiral because all four groups are different. - Note: The presence of a double bond (C=O) does not affect the chirality of this carbon. - Conclusion: **Structure II is chiral.** 3. **Analyze Structure III: `H-underset(H)underset("|")overset(H)overset("|")(C)`** - Identify the chiral carbon: The carbon here is attached to three hydrogen atoms (H, H, H) and does not have four different groups. - Conclusion: **Structure III is not chiral.** 4. **Analyze Structure IV: `C_2 H_5-overset(CH_3)overset("|")(CH)-C_2H_5`** - Identify the chiral carbon: The carbon is attached to `C_2H_5`, `C_2H_5`, `CH`, and `H`. Here, two groups are the same (`C_2H_5`), which means it does not have four different groups. - Conclusion: **Structure IV is not chiral.** ### Final Conclusion: - The chiral compounds among the given structures are **I and II**. - Therefore, the correct answer is: **Only one and two are chiral compounds.**
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