In S_N2 substitution reaction of the type

$R - \mathrm{Br} + {\mathrm{Cl}}^{-} \stackrel{\mathrm{DMF}}{\to }R - \mathrm{Cl} + {\mathrm{Br}}^{-},$

Which one of the following has the highest relative rate ?

(a) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2\mathrm{Br}$

(d) ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br}$

The pure d isomer of certain chiral compound has ${\left[\mathrm{\alpha }\right]}_d^{25}=+55°$. A non racemic mixture of this compound has a net ${\left[\mathrm{\alpha }\right]}_d^{25}=-11°$. What is the fraction of this isomer in mixture?

1. 0.40

2. 0.60

3. 0.30

4. 0.70

Which of the following compound will not exhibit chirality because of hindered rotation around C - C bond?

1. 

2. 

3. 

4. 

Which of the following compounds can be resolved into enantiomers?

1. 

2. 

3. 

4. 

In the given reaction: .

Find out the incorrect statement regarding the reaction:

1. It gives total 9 allylic brominated products 

2. 6 fractions are obtained on fractional distillation of product mixture

3. Substrate has 7 allylic hydrogens

4. NBS is a brominating agent for allylic positions

What would be the major product of the given reaction?

1. 

2. 

3. 

4. 

Total number of mono-chlorinated products are

1. 7

2. 6

3. 8

4. 18

Product B is

1. 

2. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{O}-{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{OH}$

3. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{S}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{OH}$

4. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$

In which reaction product formation does not takes place by Hofmann's Rule?

1. 

2. 

3. 

4. 

Which of the following compound would not give an E2 product when treated with sodium ethoxide?

1. 

2. 

3. 

4.