Which acid deravative is most reactive towards nucleophilic substitution reaction?

1. CH₃COCl

2. (CH₃CO)₂O

3. CH₃COOC₂H₅

4. CH₃CONH₂

For the following reactions sequence 

The structure consistent with X and Y are:

	'Y'	'X'
(1)
(2)
(3)
(4)

2–Phenylcycloprop–2–en–1–one is allowed to react with phenylmagnesium bromide and the reaction mixture is hydrolyzed with perchloric acid. The product formed is

1.
2.
3.
4.

(1) 3, 2

(2) 3, 3

(3) 4, 2

(4) 4, 3

X may be

(1)
(2)
(3)
(4)

The major product is :

(1)
(2)
(3)
(4)

$\underset{\left(1\right)}{\overset{\mathrm{HCl}}{\to }}\underset{\left(2\right)}{\overset{B{r}_2/Fe}{\to }}\underset{\left(3\right)}{\overset{H^{+}}{\to }}$

The major product is

1.
2.
3.
4.

The product is :

(1)
(2)
(3)
(4)	None

Major product is

(1)
(2)
(3)
(4)	None of these

The end product of the folloowing reaction sequence is:

(1)
(2)
(3)
(4)