Which carboxylic acid is least reactive towards
decarboxylation on heating?

The end product of the following reaction would be

$\underset{\left(\mathrm{ii}\right)<mspace\; width="1em"></mspace>∆}{\overset{\left(\mathrm{i}\right)<mspace\; width="1em"></mspace>{\mathrm{H}}_3{\mathrm{O}}^{+}}{\to }}$

When propanoic acid is treated with aqueous sodium
bicarbonate, CO₂ is liberated. The ‘C’ of CO₂
comes from

1. carboxylic acid group
2. methylene group
3. bicarbonate
4. methyl group

The appropriate reagent for the transformation is

1. Zn (Hg)/HCl

2. NH₂–NH₂/OH^–

3. Both 1. and 2.

4. None of the above

An organic compound (A) (MF C₄H₁₀O) upon
dehydrogenation gives a compound (B) which forms
phenyl hydrazone with phenylhydrazine and both the
compounds (A) and (B) respond to iodoform test.
Hence, the compound (A) is

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.