Ethyne ? Benzene 

The reagent used in the above conversion is:

1. Cr2O3

2. Alc. KOH

3. Red hot Fe

4. NaNH2/liq.NH3

Subtopic:  Aromatic Hydrocarbons - Reactions & Mechanism |
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RCOCl and AlCl3 are used in the Friedel-Crafts reaction.
The electrophile among the following is:

1. Cl+                                       

2. RCOCl

3. RC+O                                     

4. R+

Subtopic:  Aromatic Hydrocarbons - Reactions & Mechanism |
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Product (B) in the above mentioned reaction is-

1. 2.
3. 4.
Subtopic:  Aromatic Hydrocarbons - Reactions & Mechanism |
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