JSFiddle - React, Tailwind, and code Playground

HTML

<form id="myform">

<input type="radio" name="a" value="lola">
<input type="radio" name="a" value="lolb"> 
<input type="radio" name="a" value="lolc"> 
<input type="radio" name="a" value="lold">
<input type="radio" name="a" value="lole">

<br>
<input type="radio" name="b" value="lol1"> 
<input type="radio" name="b" value="lol2">
<input type="radio" name="b" value="lol3">

<br>
<input type="radio" name="c" value="lol">
<input type="radio" name="c" value="lo312l">
<input type="radio" name="c" value="l123ol">
<input type="radio" name="c" value="l121312ol">

<br>
<input type="radio" name="d" value="lzzol">

<input type="submit" value="SUBMIT!!!">
    
</form>

JavaScript

function validate() {
    
    function add() {
        if (this.checked)
            remaining[this.name] = true;
    }
    function remove() {
        if (this.checked)
            delete remaining[this.name];
    }
    debugger;
    var form = $(this), remaining = {}, errors = [];
    form.find(':radio').each(add);
    
    for (var i in remaining) {
        errors.push ('Please check ' + i);
    }
    
    if (errors.length) {
        alert (errors.join('\n'));
        return false;
    }
    
}

$('#myform').submit(validate);