Checkboxes

I have a form with checkboxes. There are 10 boxes.

1. Is there a way to gray out and disable one specific checkbox. If I use

span.wpcf7-list-item {
display: table-row;
pointer-events: none;
}

all the checkboxes are disabled.

2. Is there a way to organize the checkboxes into 2 columns of 5 checkboxes each?

Thank you.