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The operation which is commutative but not associative is:

  1. AND
  2. OR
  3. EX-OR
  4. NAND
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Best answer
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The answer is D.

Remark:

  1. Every logic gate follows Commutative law.
  2. AND, OR, Ex-OR, EX-NOR follows Associative law also. NAND, NOR doesn’t follow Associative law.
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We get for inputs 001,011,100 and 110 both the NAND  and NOR are not associative
Answer:

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