Which of the following, when undergoing addition of HBr, will form ONLY a pair of diastereomers?

Taking into account the stability of various carbocations and, as well as the rules governing mechanisms of carbocation rearrangements, which reaction is most likely to occur during the given reaction ?

Which of the following is the best stereochemical representation when reaction between 1 -methylcyclohexene and NBS react in aqueous dimethyl sulfoxide?

1.		2.
3.		4.	None of these

$\begin{array}{ccccc}{\mathrm{CH}}_3& -& \stackrel{{\mathrm{CH}}_3}{\underset{{\mathrm{CH}}_3}{\stackrel{|}{\underset{|}{\mathrm{CH}}}}}& +& {\mathrm{H}}_2\mathrm{C}\end{array}$ = CH₂$\underset{2.5^0\mathrm{C}}{\overset{\mathrm{HF}}{\to }}$(A);    (A) is:

(a) 

(b) 

(c) 

(d) CH₃-$\begin{array}{c}\underset{|}{\mathrm{CH}}\\ {\mathrm{CH}}_3\end{array}$-CH₂-CH=CH₂

Di-imide (N₂H₂) is used to reduce double bond of:

(1)  $-\underset{|}{\mathrm{C}}=\mathrm{O}$               

(2) $-\mathrm{C}\equiv \mathrm{N}$             

(3) -NO₂           

(4) -CH=CH-

End product of the reaction is:-
(a)(b)

(c)      (d)

Product (A) is:-

1.  

2. 

3.  

4. 

Compound (A) is :$$
$$

1.  

2. 

3.  

4. 

MMPP $\to$ Magnesium mono peroxy phthalate. Product (X) is:

1.   

2. 

3.  

4. 

Product (A) is:

(1) Ph-CH₂-Cl                     

(2) Ph-CH₂-Br

(3) Ph-CH₂-CCl₃                 

(4) Ph-CH₂-CBrCl₂