Which of the following biphenyls is optically active?

1. 

2. 

3. 

4. 

 

The compound A on treatment with Na gives B, and with PCl₅ gives C. B and C react together to give diethyl ether. A, B and C are in the order of: 

1. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}, {\mathrm{C}}_2{\mathrm{H}}_6, {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}$

2. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}, {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}, {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}$

3. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}, {\mathrm{C}}_2{\mathrm{H}}_6, {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$

4. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}, {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa} ,{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}$

Consider the reaction 
CH₃ CH₂ CH₂ Br + NaCN - CH₃ CH₂ CH₂ CN + NaBr 
This reaction will be the fastest in

1.  Ethanol

2.  Methanol

3.  N, N'-dimethylformamide (DMF)

4.  water

Which of the following is the halogen exchange reaction?

1.	R X + NaI \(\xrightarrow{\text{ Acetone }}\) RI + NaX
2.
3.	R - OH + HX \(\xrightarrow{\text{ ZnCl}_2~~}\) R - X + H2O
4.

What is ‘A’ in the following reaction?

1.  

2.  

3.  

4.  

Which of the carbon atoms present in the molecule given below are asymmetric?

1.  a, b, c, d

2.  b, c

3.  a, d

4.  a, b, c

Match the items of Column I and Column II.

            Column I                                   Column II

(i) ${\mathrm{S}}_{\mathrm{N}}1$ reaction                                 (a) vic-dibromides

(ii) Chemicals in fire extinguisher         (b) gem-dihalides

(iii) Bromination of alkenes                  (c) Racemisation

(iv) Alkylidene halides                         (d) Saytzeff rule

(v) Elimination of HX from alkylhalide   (e) Chlorobromocarbons

1.  (i) → (e) (ii) → (c) (iii) → (b) (iv) → (a) (v) → (d)

2.  (i) → (c) (ii) → (e) (iii) → (a) (iv) → (b) (v) → (d)

3.  (i) → (e) (ii) → (d) (iii) → (b) (iv) → (a) (v) → (c)

4.  (i) → (b) (ii) → (d) (iii) → (a) (iv) → (c) (v) → (e)

Match the reactions given in Column I with the types of reactions given in Column II.

	Column I		Column II
(i)		(a)	Nucleophilic aromatic substitution
(ii)		(b)	Electrophilic aromatic substitution
(iii)		(c)	Saytzeff elimination
(iv)		(d)	Electrophilic addition
(v)		(e)	Nucleophilic substitution (${\mathrm{S}}_{\mathrm{N}}1$)

1 (i) → (a) (ii) → (d) (iii) → (c) (iv) → (b) (v) → (e)

2. (i) → (b) (ii) → (e) (iii) → (c) (iv) → (d) (v) → (c)

3. (i) → (a) (ii) → (c) (iii) → (e) (iv) → (b) (v) → (d)

4. (i) → (b) (ii) → (d) (iii) → (e) (iv) → (a) (v) → (c)