passing a variable in name attribute in html

this code outputs different question from db until while loop expires with MCQ options of type radio:

    $sql = "SELECT * FROM questions WHERE `type` IN 
    ('".implode("','",$fin_element)."')";

    $result = $conn->query($sql);

    if ($result->num_rows > 0) {
   // output data of each row

   while($row = $result->fetch_assoc()) {
     echo "<br>";
     echo "Q:" . $row["question_name"]. "<br>";

    echo "<input type='radio' name='question1' value='answer1.1'/    >
          <code>".$row["answer1"]."</code>". "<br>";

    echo "<input type='radio' name='question1' value='answer1.2'/>
          <code>".$row["answer2"]."</code>". "<br>";

    echo "<input type='radio' name='question1' value='answer1.3'/>
          <code>".$row["answer3"]."</code>". "<br>";

    echo "<input type='radio' name='question1' value='answer1.4'/>
          <code>".$row["answer4"]."</code>". "<br>";  
    }
    } else {
   echo "0 results";
    }

but here every options of every question have the same name attribute of question1 only , but i want that for the next question name attribute should change to question2 and so on. Please help

If you have an identifier in your table question, you could use it.

But you could just use a variable to increment question number :

$index = 1 ;
while($row = $result->fetch_assoc()) {
     echo "<br>";
     echo "Q:" . $row["question_name"]. "<br>";

     echo "<input type='radio' name='question".$index."' value='answer1.1'/    >
          <code>".$row["answer1"]."</code>". "<br>";
     //...
     $index++;
 }