Bit of JS code can do the trick .
Paste this code in the JS file .
Change the value min width below which you want to destroy CKEditor
(function(){
var minWidth = 500 ; //in px .
if ($( window ).width() < minWidth ) {
//small screen device
if (typeof CKEDITOR != 'undefined') {
CKEDITOR.on("instanceReady", function(event)
{
if (typeof CKEDITOR.instances.content != 'undefined') {
CKEDITOR.instances.content.destroy();
}
if (typeof CKEDITOR.instances.a_content != 'undefined') {
CKEDITOR.instances.a_content.destroy();
}
if (typeof CKEDITOR.instances.c_content != 'undefined') {
CKEDITOR.instances.c_content.destroy();
}
});
}
};
})();
Hope this helps .
Thankks