JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<table>
  <tr>
    <td>
      <input type="radio" data-select="#item_dropdown_list1" name="radio_enable1" value="true"> True<br>
      <input type="radio" data-select="#item_dropdown_list1" name="radio_enable1" value="false"> False<br>
    </td>
    <td>
      <select id="item_dropdown_list1" name="item[dropdown_list]"  disabled="disabled" name="ruleList[].repeats" style="width: 80px;">
        <option value="${freq.frequencyName}" />                         
    </select>
    </td>
  </tr>
  
  <tr>
    <td>
      <input type="radio" data-select="#item_dropdown_list2" name="radio_enable2" value="true"> True<br>
      <input type="radio" data-select="#item_dropdown_list2" name="radio_enable2" value="false"> False<br>
    </td>
    <td>
      <select id="item_dropdown_list2" name="item[dropdown_list]"  disabled="disabled" name="ruleList[].repeats" style="width: 80px;">
        <option value="${freq.frequencyName}" />                         
    </select>
    </td>
  </tr>
</table>

JavaScript

$('input[type="radio"]').on('click', function() {
	var val = $(this).val(),
  		selectId = $(this).data('select');

    if ($(this).val() === 'true') {
        $(selectId).prop("disabled", false);
    }
    else {
        $(selectId).prop("disabled", true);
    }
});