Add Recaptcha in Custom Form in WordPress

<?php
add_action( 'wp_enqueue_scripts', 'cxc_enqueue_my_styles_scripts' );  

function cxc_enqueue_my_styles_scripts() {
	wp_enqueue_script( 'recaptcha-script', 'https://www.google.com/recaptcha/api.js' );
	wp_enqueue_script( 'custom_script', get_stylesheet_directory_uri() . '/js/custom.js', array('jquery'), '1.0.0', true );
}
?>

<form class="cxc-captcha-form">
   <input name="name" type="text" placeholder="Enter Your Name">
   <input name="email" type="email" placeholder="Enter Your Email">
   <div class="g-recaptcha" data-sitekey="{{** Enter Your Sitekey Here **}}"></div>
   <div class="captcha-error" style="color: red;"></div>
   <input name="submit" type="submit" value="Submit">
</form>

//Captcha validation script
jQuery(document).ready(function( $ ) { 
	jQuery(document).on('submit','.cxc-captcha-form',function(e){
		if(grecaptcha.getResponse() == "") {
		   	e.preventDefault();
			jQuery('.captcha-error').text("Please verify captcha");
		} else {
			jQuery('.captcha-error').text("");
		}
	});
});