Rank the following in the increasing order of rate of reaction with HBr.

(P) 

(Q)     

(R)    

1. R>P>Q

2. R>Q>P

3. P>R>S

4. P>S>R

Which of the following reactions generates the major product? Ignore stereoisomerism

(1)

(2)  

(3)  

(4)  

In the given selective hydrogenation which combination is incorrect ?

1. (w.c. = wilkinsons catalyst)

2.  (w.c. = wilkinsons catalyst)

3. 

4. $\underset{∆}{\overset{{\mathrm{H}}_2}{\to }}C{H}_2-CH=CH-C{H}_3$

$\left(\mathrm{A}\right)\stackrel{Na/N{H}_3\left(l\right)}{\to }\left(B\right)\stackrel{MCBPA}{\to }\left(C\right)$

Compound (C) in above sequence of reaction is:

1.    

2. 

3.  

4. 

$\underset{{\mathrm{R}}_2{\mathrm{O}}_2/\mathrm{hv}}{\overset{\mathrm{HBr}}{\to }}$(A);   

Major product (A) is:

(a) 

(b) 

(c) 

(d) 

What type of product will be formed in the following reaction?


1. A mixture of diastereomers  
2. Optically active
3. A pure enantiomer with 100% optical purity
4. A racemic mixture

 $\underset{∆}{\overset{{\mathrm{H}}^{+}}{\to }}$Possible products $\stackrel{{\mathrm{Br}}_2/{\mathrm{CCl}}_4}{\to }$(y) products

The number of possible products for x and y is:

(a) 2,4

(b) 3,5

(c) 3,6

(d) 3,4

Product (C) of the above reaction is :

1. 1,3-Hexadiene
2. 1,4-Pentadiene
3. 1,3-Butadiene
4. 1,3-Heptadiene

Which reagents are suitable to accomplish the mentioned conversion?

1. O₃/H₂O₂, HO^-/$∆$                               

2. HBr, alc. KOH, O₃, LiAlH₄, H⁺/$∆$

3. HBr, t-BuOK, O₃, KMnO₄, $∆$

4. HBr, alc. KOH, O₃, KMnO₄, $∆$

$\underset{0°\mathrm{C}}{\overset{{\mathrm{PCl}}_5}{\to }}\underset{70-80\%}{\left(\mathit{A}\right)}\underset{\left(2\right) {\mathrm{H}}^{\oplus }}{\overset{\left(1\right) 3{\mathrm{NaNH}}_2, \mathrm{mineral} \mathrm{oil}}{\to }}\underset{46\%}{\left(B\right)}$; Product (B) is: