Which of the following statements is true regarding the projections shown below?

1. 'A' and 'B' both represent the same configuration.
2. Both 'A' and 'B' are optically active.
3. 'B' alone is optically active.
4. 'A' alone is optically active.

Arrange the following in the order of C-Br bond strength in a polar solvent

1. I<II<III<IV

2. III<IV<I<II

3. IV<III<II<I

4. II<I<III<IV

What is the correct order of reactivity for the following compounds in an \(S_N 1\) reaction?

Which of the following compounds will give racemic mixture on nucleophilic substitution by OH${}^{-}$ ion?

(i)
(ii)
(iii)

  
1.  (iii) 
2.  (i), (ii) and (iii)     
3.  (ii) and (iii)     
4.  (i) and (iii) 

How many unique substitution products can be formed when ethane reacts with bromine under sunlight?

A in the reaction below is:

1.		2.
3.		4.