JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#">Disable every-other option</a>
<select>
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
</select>

JavaScript

$('a').on('click', function () {
    $('select').children(':nth-child(even)').prop('disabled', true);
});