JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1">
   Q1
  <input type="radio" name="r1" value="v1" />
  <input type="radio" name="r1" value="v2" />
  <input type="radio" name="r1" value="v3" />
  <br/>Q2
   
  <input type="radio" name="r2" value="v1" />
  <input type="radio" name="r2" value="v2" />
  <input type="radio" name="r2" value="v3" />
    <br/>Q3  
    
  <input type="radio" name="r3" value="v1" />
  <input type="radio" name="r3" value="v2" />
  <input type="radio" name="r3" value="v3" />
</div>
<br/>
<input id="btn" type="submit" text="submit"/>

JavaScript

$('#btn').click(function(){
    if ( $('#div1 input:radio:checked').size() == 3 )    
        return true;
    return false;
});