set dragable false for particular div in angular js with ionic

This is used for match the following option. While I drag the div id 'div2' along with this first div id 'div1' also to be dragged. how to set draggable false for div id 'div1'

.controller('BEGINNER_UNIT_1_CONVERSATION_ACTIVITY_2', function($scope, $stateParams, $http) 
{   
    $scope.OnDropComplete = function (index, source) 
    {
        var otherObj = $scope.category_Question[index];
        var otherIndex = $scope.category_Question.indexOf(source);
        $scope.category_Question[index] = source;
        $scope.category_Question[otherIndex] = otherObj;
    }         
})    
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<div ng-repeat="source in category_Question" ng-controller="BEGINNER_UNIT_1_CONVERSATION_ACTIVITY_2"  >
      <div class="card" id="div1" draggable="false">
        <div class="item item-divider">{{ $index+1 }}.Sentence </div>
        <div class="item item-text-wrap" style="color:#CC0066;font-weight:bold;">{{ source.Sentance }}</div>
      </div>      
      <div class="card" id="div2" ng-drop="true" ng-drop-success="OnDropComplete($index,$data)">
        <div ng-drag="true" ng-drag-data="source" ng-class="source.Response">
      <div class="item item-divider">Response</div>
      <div class="item item-text-wrap"> {{ source.Response }} </div>
    </div>
  </div>
</div>
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