Problem 2: According to the Cahn-Ingold-Prelog rules which group has the highest priority in each of the following pairs. i) ii) iii) iv) v) - H I -C-CI H H -C-CH3 H e R AICMCIT H I -C-BH₂ H - R CH3 -C-CH3 I H R XX R

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**Problem 2: According to the Cahn-Ingold-Prelog rules, which group has the highest priority in each of the following pairs?**

**Pairs:**

i)   
- Left:  
  \[ \text{H}_3\text{C} - \text{C} - \text{Cl} \,\text{(Chlorine atom bonded to carbon)} \]
- Right:  
  \[ \text{H}_3\text{C} - \text{C} - \text{BH}_2 \,\text{(Boron atom bonded to carbon)} \]

ii)  
- Left:  
  \[ \text{H}_3\text{C} - \text{C} - \text{CH}_3 \,\text{(Connected by a single bond)} \]
- Right:  
  \[ \text{H}_3\text{C} - \text{C} = \text{CH}_3 \,\text{(Connected by a double bond)} \]

iii)  
- Left:  
  \[ \text{R} - \text{C} = \text{C} \,\text{(Alkene)} \]
- Right:  
  \[ \text{R} - \text{C} \equiv \text{C} \,\text{(Alkyne)} \]

iv)  
- Left:  
  \[ \text{R} - \text{(CH}_2\text{)}_2 - \text{CH}_3 \,\text{(Linear alkyl chain)} \]
- Right:  
  \[ \text{R} - \text{C} \,(CH_3)_3 \,\text{(Branched alkyl group)} \]

v)  
- Left:  
  \[ \text{R} - \text{C} \equiv \text{C} - \text{H} \]
- Right:  
  \[ \text{R} - \text{C} \,(CH_3)_3 \,\text{(Branched alkyl group)} \]

**Explanation:**

- The Cahn-Ingold-Prelog rules are used to determine the priority of substituents around a chiral center, often crucial in stereochemistry for assigning R or S configurations.
-
Transcribed Image Text:**Problem 2: According to the Cahn-Ingold-Prelog rules, which group has the highest priority in each of the following pairs?** **Pairs:** i) - Left: \[ \text{H}_3\text{C} - \text{C} - \text{Cl} \,\text{(Chlorine atom bonded to carbon)} \] - Right: \[ \text{H}_3\text{C} - \text{C} - \text{BH}_2 \,\text{(Boron atom bonded to carbon)} \] ii) - Left: \[ \text{H}_3\text{C} - \text{C} - \text{CH}_3 \,\text{(Connected by a single bond)} \] - Right: \[ \text{H}_3\text{C} - \text{C} = \text{CH}_3 \,\text{(Connected by a double bond)} \] iii) - Left: \[ \text{R} - \text{C} = \text{C} \,\text{(Alkene)} \] - Right: \[ \text{R} - \text{C} \equiv \text{C} \,\text{(Alkyne)} \] iv) - Left: \[ \text{R} - \text{(CH}_2\text{)}_2 - \text{CH}_3 \,\text{(Linear alkyl chain)} \] - Right: \[ \text{R} - \text{C} \,(CH_3)_3 \,\text{(Branched alkyl group)} \] v) - Left: \[ \text{R} - \text{C} \equiv \text{C} - \text{H} \] - Right: \[ \text{R} - \text{C} \,(CH_3)_3 \,\text{(Branched alkyl group)} \] **Explanation:** - The Cahn-Ingold-Prelog rules are used to determine the priority of substituents around a chiral center, often crucial in stereochemistry for assigning R or S configurations. -
Expert Solution
Step 1: Interpretation of given problem

Given are organic groups.

According to Cahn-Ingold-Prelog rules priority is assigned with respect to atomic number


If there are two substituents with equal rank, proceed along two substituent chain until there is point of difference and then give priority on that basis.



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