It’s easy to convert a color image to black and white in any photo editor, Lightroom included, but to get a strong black and white look you often have to do a little more besides. Here’s a look at the B&W mode, B&W panel and the Tone Curve.
B&W mode (Lightroom Basic panel, Develop mode)
This is an option at the top of the Basic panel in Lightroom's Develop mode. It switches the image to black and white, but it also enables a B&W panel in the adjustments below to change how different colors are rendered as shades of gray.