You forgot to load chosen library:
wp_register_script( 'js_chosen', 'https://raw.github.com/harvesthq/chosen/master/chosen/chosen.jquery.js', array('jquery') );
wp_register_script( 'js_custom', plugin_dir_url( __FILE__ ) . 'js/jquery.js', array('jquery', 'js_chosen') );
wp_enqueue_script ( 'js_custom' );
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