{
    "QnACollection": {
        "QnA": [
            {
                "id": 11,
                "question": "What was your childhood nickname?"
            },
            {
                "id": 12,
                "question": "In what city was your mother born?"
            },
            {
                "GroupType": "RUN",
                "id": 45,
                "question": "What is the first name?"
            }
        ]
    }
}

var value = (string)JObject.Parse(json)
            .Descendants().OfType<JProperty>()
            .FirstOrDefault(p => p.Name == "GroupType");