The aryl group left after the removal of a hydrogen atom from benzene is called..............group while that obtained from methyl group of toluene is called............group.

Answer

To solve the question, we need to identify the groups formed when hydrogen is removed from benzene and toluene.

### Step 1: Understand the structure of benzene
Benzene is a simple aromatic hydrocarbon with the formula C6H6. It consists of a ring of six carbon atoms, with alternating double bonds, and each carbon atom is bonded to one hydrogen atom.

### Step 2: Identify the aryl group from benzene
When we remove one hydrogen atom from benzene (C6H6), we are left with a structure that still retains the aromatic character. This structure is known as the **phenyl group** (C6H5). Therefore, the aryl group left after the removal of a hydrogen atom from benzene is called the **phenyl group**.

### Step 3: Understand the structure of toluene
Toluene is a methyl-substituted derivative of benzene, with the formula C7H8. It consists of a benzene ring (C6H5) with an additional methyl group (CH3) attached to one of the carbon atoms.

### Step 4: Identify the group from toluene
When we remove a hydrogen atom from the methyl group of toluene, we are left with the structure that contains the benzene ring and the remaining methyl group. This structure is known as the **benzyl group** (C6H5CH2). Therefore, the group obtained from the methyl group of toluene is called the **benzyl group**.

### Final Answer
The aryl group left after the removal of a hydrogen atom from benzene is called the **phenyl group**, while that obtained from the methyl group of toluene is called the **benzyl group**.

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