Disable all any elements who has class name

See more:

jQuery

Hi All,

I want to disable all elements who contains class name pqr.

<input class = "abc pqr" id = "txt" type="text">
<input class = "abc pqr" id = "chk" type="checkbox">
<input class = "xyz pqr" id = "file" type="file">
<input class = "abc pqr" id = "date" type="date">
<select class = "abc pqr jkl">
<input class = "pqr" id = "date" type="radio">

How to achieve above things.

What I have tried:

I have tried with attr attribute.