Nucleophilic Substitution in Aryl Halides

Q.

Why ketones do not give Tollens test?

Q. The relative reactivity of 1, 2^° and 3^° hydrogens in chlorination reaction has been found to be 1:3.8:5. In the reaction The ratio of the amount of the product A, B, C and D is expected to be(2) 3 : 7.6 :5:6(4) 1 :7.6 5: 1(1) 1:3.8: 5(3) 3:78:5:3

Q.

Which compound act as oxidising agent only.

(1)$S{O}_2$

(2)$H_{2}S$

(3)$H_{2}S{O}_4$

(4)$HN{O}_2$

Q.

Detection of chlorine is possible without preparing sodium extract in

1. 

2. CH₂ = CH - CH₂ - Cl

3. 

4. CHCl₃

Q. Aryl halides are less reactive than alkyl halides towards nucleophilic substitution reaction because of

1. formation of less stable carbonium ion
2. inductive effect
3. larger C—halogen bond
4. resonance stabilization

Q. assertion: cis-1, 3-dihydroxycyclohexane exists in boat conformation reason: in the boat form there will not be hydrogen bonding between the 2 hydroxyl groups

Q.

The hybridization involved in BCl₃NH₃ is:

1. sp³d²

2. sp

3. sp³d

4. sp³

Q. Which of the following compound will be formed as major product when ethyl chloride reacts with $AgCN$ ?

1. Ethylcyanide
2. Both (a) and (b) will be formed in same quantities
3. Ethylisocyanide
4. Acetonitrile

Q. How would you convert the following compound into benzene?

Q. 10. Assertion Ehtene is more reactive than propene towards electrophlic attack. Reason. Propene is stabilsed by no bond resonance

Q. 11.2grams carbon reacts completely with 19.63litre oxygen at ntp.the cooled gases are passed through 2litre of 2.5normal NaOH solution. Calculate concentration of remaining NaOH and sodium carbonate in solution \lbrack CO doesnot react with NaOH under this codition\rbrack

Q. 26.2 mole of NaOH mix with 20 mol H2O. Find molality of NaOH??

Q.

Beryl is

1. 3BeO . 3 Al2O3 . 3SiO2

2. 3BeO. Al2O3. 6SiO2

3. BeO. Al2O3. SiO2

4. 4Al2O3. 6Be. 10SiO2

Q. Which compound undergoes nucleophilic substitution with NaCN at the fastest rate?

1. 
2. 
3. 
4. 

Q. 3. What is the formula to be used to find hybridisation of a molecule ?

Q.

The enthalpy of hydrogenation of cyclohexane os -119.5 Kj/mol. If resonance energy of bemzene is -150.4 kj/mol, its enthalpy of hydrogenation would be?

Ans: -208.1 kj/mol.

How?

Q. The halide which undergoes nucleophilic substitution most readily is

1. 
2. 
3. 
4. 

Q. Bottles containing C₆H₅I and C₆H₅CH₂I lost their original labels. They are labelled as A and B. A and B were separately taken in a test tubes and boiled with NaOHsolution.Then in each test tube Dilute HNO₃ and Ag NO₃ was added. Substance B gave a yellow precipitate. Which one of thefollowingstatements is true for this experiment?

1. Addition of HNO₃ was not necessary

2. A was C₆H₅CH₂I

3. A was C₆H₅Cl

4. B was C₆H₅I

Q. what are poisons in chemistry and what are its uses

Q. why carbonateions(HCO_3^- ) are inorganic compounds and CCl_{4 }and CF_4 are organic compound

Q.

3 (a) Define chemical reaction.