Fill in the blanks with appropriate words. Benzene has a planar structure. All carbon atoms in benzene are (I)____ hybridised. The ring structure of benzene was proposed by (II)________. It shows (III)_______substitution reactions. It reacts with (IV)_________in presence of aluminium chloride to form acetophenone.

Options

A. `I-sp^(2)`,II-Kekule, III-electrolphilic, IV-acetyl chloride
B. `I-sp`, II-Dewar, III-Nucleophilic, IV-chloroethane
C. `I-sp^(2)`, II-Ladenberg, III-electrophilic, IV-chloroethane
D. `I-sp^(2)`, II-Baeyer, III-nucleophilic, IV-methyl bromide

Answer

To solve the question, we need to fill in the blanks with the appropriate words based on our understanding of benzene and its reactions. Let's go through each blank step by step.

### Step 1: Hybridization of Carbon Atoms in Benzene
Benzene has a planar structure, and each carbon atom in benzene is involved in forming three sigma bonds (two with hydrogen atoms and one with another carbon atom) and one pi bond (with another carbon atom). This arrangement leads to the hybridization of the carbon atoms.

**Answer for Blank (I)**: **sp²**

### Step 2: Scientist Who Proposed the Ring Structure of Benzene
The ring structure of benzene was proposed by a prominent chemist in the 19th century. This scientist suggested that benzene has a cyclic structure with alternating double bonds.

**Answer for Blank (II)**: **August Kekulé**

### Step 3: Type of Substitution Reaction
Benzene undergoes a specific type of substitution reaction where an electrophile replaces one of the hydrogen atoms on the benzene ring. This type of reaction is characteristic of aromatic compounds.

**Answer for Blank (III)**: **Electrophilic aromatic substitution**

### Step 4: Reagent Used in the Reaction with Benzene
When benzene reacts in the presence of aluminum chloride, it typically reacts with an acyl chloride to form acetophenone. The acyl chloride is the reagent that facilitates this reaction.

**Answer for Blank (IV)**: **Acetyl chloride**

### Final Answers:
1. (I) **sp²**
2. (II) **August Kekulé**
3. (III) **Electrophilic aromatic substitution**
4. (IV) **Acetyl chloride**