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.  

The reactant  'A' in the above reaction is-

1.       2.  

3.       4.  

Which of the following will undergo Cannizzaro reaction?

1.       2.  

3.          4.