Identify (X) in the sequence :

$C_3{H}_{8}O\underset{H_{2}S{O}_4}{\overset{K_{2}C{r}_2{O}_7}{\to }}{C}_3{H}_{6}O\underset{warm}{\overset{I_2+NaOH}{\to }}CH{I}_3$
$<mspace\; width="1em"></mspace>\left(X\right)$

(1) $C{H}_3-C{H}_2-C{H}_{2}OH$

(2) $C{H}_3-CH-C{H}_3$
$<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>l$
$<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>OH$

(3) $C{H}_3-O-C{H}_2-C{H}_3$

(4) $C{H}_3-C{H}_2-CHO$

$R-C{H}_2-C{H}_2-OH$ can be converted into $R-C{H}_2-C{H}_2-COOH$. The correct sequence of

reagents is

(1) $PB{r}_3,<mspace\; width="1em"></mspace>KCN,<mspace\; width="1em"></mspace>H_3{O}^{+}$

(2) $PB{r}_3,<mspace\; width="1em"></mspace>KCN,<mspace\; width="1em"></mspace>H_2$

(3) $KCN,<mspace\; width="1em"></mspace>H_3{O}^{+}$

(4) $HCN,<mspace\; width="1em"></mspace>PB{r}_3,<mspace\; width="1em"></mspace>H_3{O}^{+}$

Major product maybe

1.       2.  

3.       4.  

Given the reaction:
 + 

Which of the following statements is correct?

1. (b) has a lesser stability

2. (b) is more volatile than (a)

3. (a) is more volatile than (b)

4. (a) forms higher yields at a lower temperature

1.       2.  

3.       4.  

Major product 'A' and 'B' are respectively

1.       

2. 

3.         

4. 

The reagents that produce compound A mentioned below in a Diels-Aider reaction are

1.       2.  

3.       4.  

The following reaction gives

1.       2.  

3.       4.  

1.   
   2.  

3.     
 4.  

Which of the following will undergo Cannizzaro reaction?

1.       2.  

3.          4.