Which is most reactive for S_N2 reactions ?

(1) CH₃I

(2) C₂H₅I

(3) C₃H₇I

(4) C₄H₉I

Which of the following options is correct?

1. CH₃-CH=CH-CH₃ predominates

2. CH₂=CH-CH₂-CH₃ predominates

3. Both are formed in equal amounts

4. The product ratio is dependent on the halogen X

Identify (Z) in the following reaction series,

C₂H₅I$\underset{\mathrm{KOH}}{\overset{\mathrm{Alcoholic} }{\to }}$ (x) $\stackrel{{\mathrm{Br}}_2}{\to }$ (Y) $\stackrel{\mathrm{KCN}}{\to }$(Z):

1. CH₃-CH₂-CN

2. $\begin{array}{ccc}\underset{\mathrm{CN}}{\underset{|}{{\mathrm{CH}}_2}}& -& \underset{\mathrm{CN}}{\underset{|}{{\mathrm{CH}}_2}}\end{array}$

3. $\begin{array}{ccc}\underset{\mathrm{Br}}{\underset{|}{{\mathrm{CH}}_2}}& -& \underset{\mathrm{CN}}{\underset{|}{{\mathrm{CH}}_2}}\end{array}\begin{array}{}\end{array}$

4. $\begin{array}{ccc}\underset{\mathrm{Br}}{\underset{|}{\mathrm{CH}}}& =& \underset{\mathrm{CN}}{\underset{|}{\mathrm{CH}}}\end{array}$

Ethylidene dichloride on treatment with aqueous KOH gives:

(1) CH₃CHO

(2) $\begin{array}{c}\underset{|}{{\mathrm{CH}}_2\mathrm{OH}}\\ {\mathrm{CH}}_2\mathrm{OH}\end{array}$

(3) HCHO

(4) $\begin{array}{c}\underset{|}{\mathrm{CHO}}\\ \mathrm{CHO}\end{array}$

Mark the appropriate reagent used to distinguish vicinal and geminal dihalides.:

A compound A of formula C₃H₆Cl₂ on reaction with alkali can give B of formula C₃H₆O or C of formula C₃H₄. B on oxidation gave a compound of the formula C₃H₆O₂. C with dilute H₂SO₄ containing Hg²⁺ ion gave D of formula C₃H₆O, which with bromine and NaOH gave the sodium salt of C₂H₄O₂. Then A is:

1. CH₃CH₂CHCl₂

2. CH₃CCl₂CH₃

3. CH₃CHClCH₂Cl

4. CH₂ClCH₂CH₂Cl

Ethylene on treatment with chlorine gives:-

1. Ethylene dichloride

2. Ethylene chlorohydrin

3. CH₄

4. C₂H₆

The compound A forms B with sodium metal and again A forms C with PCl₅, but B and C form diethyl ether. Thus A, B and C are:

(1) C₂H₅OH, C₂H₅ONa , C₂H₅Cl

(2) C₂H₅OH, C₂H₅Cl, C₂H₅ONa

(3) C₂H₅OH, C₂H₅Cl, C₂H₄Cl₂

(4) C₂H₅OH, C₂H₅Cl, C₂H₅OC₂H₅

Which chloro derivative of benzene among the following would undergo hydrolysis most readily with aqueous NaOH to furnish the corresponding hydroxy derivative?

1. 

2. 

3. 

4. ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl}$

Which would be least reactive towards bromine?

(1) Nitrobenzene

(2) Anisole

(3) Phenol

(4) Chlorobenzene