here is my html code
<form method="post" action="email-check.php" class="col-lg-6 col-md-offset-3">
<div class="form-group">
<input class="form-control" type="email" name="email" placeholder="Email" required>
</div>
<div class="g-recaptcha" data-sitekey="#####" ></div>
<button class="btn btn-info" type="submit">submit</button>
</form>
what jquery code i must to add to my page to avoid submit form when user not check checked box google recaptcha