Total number of deactivating groups in aromatic electrophilic substitution among: -NHCOCH₃, -CN, -OCH₃, -COOH is .

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Step 1: Identifying Deactivating Groups
Deactivating groups are electron-withdrawing groups that reduce ring electron density.
- : Activating (lone pair on Nitrogen).
- : Deactivating (Strong electron-withdrawing).
- : Activating (lone pairs on Oxygen).
- : Deactivating (Electron-withdrawing carboxylic group).

Step 2: Count
The deactivating groups are cyano and carboxyl. Total count = 2.

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