Which of the following react with HBr at faster rate?

Identify the major product,

1.     

2.   

3.    

4. 

$\stackrel{{\mathrm{LiAlH}}_4}{\to }$(A) Major; Product (A) is:   

(a) 

(b) 

(c) 

(d) 

$\stackrel{{\mathrm{H}}_2{\mathrm{CrO}}_4}{\to }$(A) Product (A) is:   

(a) No reaction

(b) 

(c) 

(d) 

Consider the following alcohols,

(I)  (II) 

(III) (IV) 

The order of decreasing reactivities of these alcohols towards nucleophilic substitution with HBr is:-

(a) III>I>IV>II

(b) III>I>II>IV

(c) I>III>IV>II

(d) I>III>II>IV

The structure of A in the below mentioned reaction is:

 

1.		2.
3.		4.

$\underset{\left(2\right) {\mathrm{H}}^{+}, {\mathrm{H}}_2\mathrm{O} }{\overset{\left(1\right) \mathrm{EtLi} (3.5 \mathrm{eq})}{\to }} \left(\mathrm{A}\right) 65\% \mathrm{Yield}$; Chemist added extra 0.5 mole of Et-Li in above reaction to obtain product (A), which is ?

What is the major product (A) in the following reaction?

1.		2.
3.		4.