Which of the following is a meso compound

1. Which of the following is a meso compound?2. Identify the following compounds as R or S?3. Which of the following compounds has anS configuration?Which of the following is a meso compound?1234 Identify the following compounds as R or S.1S S R2S S S3S R S4R S S5R R R Which of the following compounds has an S configuration?1234