which ONE of these sentences uses the word connoisseur incorrectly?

A connoisseur of opera, my cousin also enjoyed the Grand Ole Op'ry

Elisa, a philanthropist and connoisseur, left her collection of 20th century art, valued at more than 40 million dollars, to the San Francisco Museum of Modern Art.

She is a natural connoisseur of the computer, able to invent programs almost effortlessly.

Although this vase looks irregular and rough, connoisseurs of Japanese pottery prize it as a fine piece of raku.

The third sentence, because even if she is able to invent programs, it does not mean she is able to pass critical judgments about it.

The third sentence is incorrect in usage.

The sentence that uses the word "connoisseur" incorrectly is:

Although this vase looks irregular and rough, connoisseurs of Japanese pottery prize it as a fine piece of raku.

To determine which sentence uses the word "connoisseur" incorrectly, we need to understand the meaning of the word. A connoisseur is someone who is knowledgeable and has expertise in a particular area, especially in fine arts or appreciation of certain things.

Let's analyze each sentence:
1. A connoisseur of opera, my cousin also enjoyed the Grand Ole Op'ry - This sentence uses the word correctly, implying that the cousin is knowledgeable about opera and also enjoys the Grand Ole Op'ry.
2. Elisa, a philanthropist and connoisseur, left her collection of 20th-century art, valued at more than 40 million dollars, to the San Francisco Museum of Modern Art. - This sentence uses the word correctly, describing Elisa as both a philanthropist and someone with expertise in art.
3. She is a natural connoisseur of the computer, able to invent programs almost effortlessly. - This sentence uses the word correctly, suggesting that the person mentioned has a deep understanding and natural ability with computers.
4. Although this vase looks irregular and rough, connoisseurs of Japanese pottery prize it as a fine piece of raku. - This sentence uses the word incorrectly. It implies that connoisseurs of Japanese pottery appreciate a vase that appears irregular and rough, which contradicts the typical notion of a connoisseur valuing items of high quality or refined craftsmanship.

Therefore, the sentence that uses the word "connoisseur" incorrectly is number 4.