Which of the following compound will give a positive iodoform test?

1.        2.  

3.        4.  All of these

$\stackrel{\mathrm{Conc}. {\mathrm{H}}_2{\mathrm{SO}}_4}{\to } \left(\mathrm{B}\right) \left(\mathrm{major} \mathrm{product}\right). \mathrm{Product} \left(\mathrm{B}\right) \mathrm{is}$

1.             2.  

3.          4.  

The product of acetone with ${\mathrm{PCl}}_5$ is

1.  ${\mathrm{ClCH}}_2{\mathrm{COCH}}_2\mathrm{Cl}$

2.  ${\mathrm{CH}}_3{\mathrm{COCH}}_2\mathrm{Cl}$

3.  ${\mathrm{CH}}_3{\mathrm{COCHCl}}_2$

4.  ${\mathrm{CH}}_3{\mathrm{CCl}}_2{\mathrm{CH}}_3$

The product 'A' in the below mentioned reaction is:

${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{COOH}\frac{\left(\mathrm{i}\right){\mathrm{Br}}_2/{\mathrm{PCl}}_3}{\left(\mathrm{ii}\right){\mathrm{H}}_2\mathrm{O}}$ $\stackrel{}{\left(\mathrm{major}\right)}$ $\mathrm{product}\left(\mathrm{A}\right)$ 

1.		2.
3.		4.

The major product in the following reaction sequence is-

1.                            

2.  

3.         

4.  

1.           2.  

3.                    4.  

Identify Y in the following sequence

1.         2.  

3.                4.  

B maybe-

1.         2.  

3.               4.  

Identify A in the following sequence of reactions?

1.        2.  

3.        4.  HCN

A and B respectively are

1.             2.  

3.               4.