R and S Configuration

Q. Give the R/S configuration of this alanine.

1. S
2. D
3. L
4. R

Q.

The absolute configuration of

is

1. (2S, 3S)

2. (2R, 3R)

3. (2S, 3R)

4. (2R, 3S)

Q. In terms of R/S or CIP rules, the configuration of the following compound is

1. R
2. S
3. no chiral centre

Q. $C{H}_3-CH=C=CH-CH=CH-CH=C=CH-C{H}_3$
Find the number of stereoisomers of the given compound.

Q. In terms of R/S or CIP rules, the configuration of the following compound is

1. R
2. S
3. no chiral centre