Electrophile

Q.

The order of boiling point of $N{H}_3,H_{2}O,HFandP{H}_3$ is

1. H₂O > HF > NH₃> PH₃

2. H₂O > HF > PH₃> NH₃

3. H₂O >NH₃>HF > PH₃

4. PH₃> NH₃> HF > H₂O

Q. 4. R-C(triple bond)C-H + Na gives product X. X on reaction with Y gives R-C(triple bond)C-R. The reagent Y can be : 1) RMgBr 2) RCl 3) RNH2 4) RH

Q.

The conductometric titration curve for $C{H}_{3}COOH$ against $NaOH$ can be given as

1. 
2. 
3. 
4. 

Q. Permanganate ion teacts with bromide ion in basic medium to give manganese dioxide and bromate ion. Write balanced ionic equation for the reactio

Q. What will be delta H for the reaction CH2Cl2 gives C + 2H + 2Cl? (B.E. of C-H and C-Cl bonds 416 kJmol-1 and 325 kJmol-1 respectively) a)832 kJ b)1482 kJ c)650 kJ d)1855 kJ

Q. Out of the following reagents, electrophiles are (i) R_3N (ii) :CCl_2 (iii) CH_3^+ (iv) H_2O (v)H_3O^+ (vi) Na^+ (1) (i), (ii) , (iii) (iv), (v) (2) (ii), (iii), (v) (3) (ii), (iii), (iv) (4) (ii), (iii), (iv), (v), (vi)

Q.

The bond angle of a molecule undergoing sp² hybridisation is:

1. 100°

2. 90°

3. 120°

4. 180°

Q. Explain the Zeolite process?

Q. Optically active isomer (A) of $\left(C_5{H}_{9}Cl\right)$ on treatment with one mole of $H_2$ gives an optically inactive compound (B) compound (A) will be :

1. $C{H}_3-\underset{C{H}_{2}Cl}{\underset{|}{C}}H-CH=C{H}_2$
2. $Cl-\underset{C{H}_3}{\underset{|}{C}}H-CH=CH-C{H}_3$
3. $C{H}_3-C{H}_2-\underset{Cl}{\underset{|}{C}}H-CH=C{H}_2$
4. $C{H}_3-\underset{Cl}{\underset{|}{C}}H-C{H}_2-CH=C{H}_2$

Q. Which one of the following series contains only electrophiles?

1. $H_{2}O,S{O}_3,H_3{O}^{+}$
2. $H_{2}O,N{H}_3,AlC{l}_3$
3. $AlC{l}_3,S{O}_3,N{O}_2^{+}$
4. $H_{2}O,C{l}^{+},N{H}_3$

Q. Que 2) N2H5+ is behave as nucleophile but not electrophile or Ambiphile why explain ?

Q. 1 In 1 - chlora 4 -bromobenzene electrophile will attack where and who is considered as more activating gr and what will be the major pdt?

Q. Hydrogen bonding plays a central role in which of the following phenomena?

1. Dimerisation of acetic acid in benzene
2. Formic acid is more acidic than acetic acid
3. Higher Lewis basicity of primary amines than tertiary amines in aqueous solutions
4. Ice floats in water

Q. Give any three examples of electrophiles and nucleophiles ?

Q.

Identify the reagents shown in bold in the following equations as nucleophiles or electrophiles:

Q. The species having highest number of resonating structures is (1) CO2 (3) PO4^3- (2) NO3- 4) HCOO-

Q.

Which of the following is a neutral electrophile?

1. $O{H}^{\ominus }$

2. $R-O^{\ominus }$

3. $AlC{l}_3$

4. $B{H}_3$

Q. What is $O{H}^{-}$?

1. $Electrophile$
2. $Nucleophile$
3. $Free$ $radical$
4. $Ambiphiles$