Practice on GOC

Start practice on goc

1. Inductive Effect

1. Write the correct order of acidity.

1. P> Q > R > S 
2. Q > P > R> S
3. Q > R > S > P
4. S > R > Q > P

     

ans : C

2. What is the correct increasing order of extent of deprotonation of the following acids in its aqueous solution ?

1. II < I < III < IV
2. IV < III < I < II
3. I < IV < III < II
4. I < II < III < IV

     

ans : d

3. The acidic strength of substituted carboxylic acid is known to depend on nature and position of substituents. In the following examples, an attempt has been made to arrange the acids in decreasing order of acidic strength. Which one of the series is incorrect ?

     

ans : b

4. Arrange the following in decreasing order of basic strength.

1. I, III and II
2. II,I, and III
3. III, II, and I
4. I, II and III 

     

ans : d

5.  which of the following has the largest acid dissociation.

     

ans : b

6. The decreasing order of -I effect of following.

1. I > II > III > IV 
2. II > I > III >IV
3. I > III > II > IV
4. II > I > IV > III

     

ans : a

2. Resonance

1. Which of the following resonating structures of 1-methoxy-1,3-butadiene is least stable?

     

ans : c

2. Arrange the following compound in increasing order of their C-N bond

1. IV < III < I < II
2. IV < I < III < II
3. I < IV < III < II
4. III < IV < I <II

     

ans : d

3. Arrange the following in decreasing order of stability

1. I > III > II > IV
2. I > IV > II > III
3. I > II > III > IV
4.  IV > III > II > I

     

ans : c

4. Which of the following is not a valid resonance structure of p-aminobenzaldehyde?

     

ans : d

6. Which of the following is not a resonance structure of other ?

     

ans : c

7. The most stable resonating structure of

 is:-

     

ans : 2

8. Arrange the following in the increasing order of acidic strength.

1. I < II < III < IV
2. I < III < II < IV
3. I < II < IV < III
4. IV < III < II < I

     

ans : b

9. Arrange the following in decreasing order of basic strength.

1. I,II and III
2. III,II and  I
3. II,I and III
4. III,I and II

     

ans : a

3.Hyperconjugation Effect

1. What is the order of enthalpy of hydrogenation of the following compound ?

1. III < IV < I < II
2. IV < III < II < I
3. I < II < III < IV
4. II < I < IV < III

     

ans : c

2. Which of the following alkene is most recative towards an electrophilic H+ ion?

     

ans : b

3. Which of the following molecule has highest electron density in the phenyl ring ?

     

ans : a

4. The decreasing order of -I effect of following.

1. I < II < III
2. II < I < III
3. III < II < I
4. II < III < I

     

ans : b

4. Basicity, Aromaticity,hydrogen bonding, Dipole moment

1. Dipole moment is shown by

1. 1,4dichloro benzene
2. cis-1,2-dichloro ethane
3. Trans-1,2-dichloro,2-pentene
4. Trans-1,2-dichloro ether

     

ans : b

2. Hetrolysis of carbon-chloride bond produces.

1. Two free radicals
2. Two carbonium ions
3. Two carbanions
4. One cation and one anion

     

ans : b

3. The correct order of decreasing reactivity of anisole (I) benzene (II) and nitrobenzene (III) towards aromatic substitution with a electrophile.

1.  II > III > I
2. III > II > I
3. II > I > III
4. I > II > III

     

ans : d

4. Which of the following is the most stable carbocation ?

     

ans : b

5. The decreasing order of -I effect of following.

     

ans : c

6. Which is the strongest base that can exist in water.

     

ans : d

7. Which of the following species is/are anti-aromatic ?

     

ans : a,d

8. The decreasing order of nucleophilicity of the following is.

1. IV > III > I > II
2. III > I > II > IV
3. IV > III > II > I
4. I > II > III > IV

     

ans : c

9. Select the species which is not aromatic.

     

ans : c

10. What is the increasing order of basic strength of the following compounds in aqueous solution ?

1. I < II < III < IV
2. I < II < IV < III
3. III < I < II < IV
4. III < I < IV < II

     

ans : c

5. Bond Fission, Reagents, Reactive and their Stability

1. Which of the following reactions is an example of elimination reaction ? 

1. Nitration benzene
2. Electrophilic substitution
3. Dehydration of ethanol
4. None of these

     

ans : c

2. Which of the following is an electrophile ?

1. H2O
2. SO3
3. NH3
4. ROR

     

ans : b

3. Among the given cations , the most stable carbonium ion is.

1. sec-butyl
2. tert-butyl
3. n-butyl
4. None of these

     

ans : b

4. Which of the following species is paramagnetic in nature ?

1. Free radical
2. Carbonium ion
3. Carbanion
4. All of the above

     

ans : c

5. Which is the following free redicals is most stable ?

1. Primary
2. Methyl
3. Secondary
4. Teritary

     

ans : d

6. Which is not an electrophile ?

1. NH4+
2. BCl3
3. BH3
4. H+

     

ans : a

7. Strongest nucleophile is.

1. RNH2
2. ROH
3. C6H50-
4. CH3O-

     

ans : d

8. Which of the following is most stable compound ?

     

ans : a

9. Which of the following will be most easily attacked by an electrophile ?

     

ans : b

10. Which is the decreasing order of stability ?

1. i < ii < iii
2. i > ii > iii
3. iii > ii > i
4. ii > iii > i

     

ans : b

11. Which of the following cation is most stable ?

     

ans : a

12. Which is the most stable carbocation ?

     

ans : d

13. Which is the most stable carbocation ?

     

ans : d

6. Types of Reaction

1. Which of the following cannot be used in Friedal-craft's reactions ?

1. FeCl3
2. FeBr2
3. AlCl3
4. NaCl

     

ans : d

2. The nitration of compound is beacuse of the 

1. NO2
2. NO3
3. NO
4. NO2+

     

ans : d

3. Formation of ethylene from acetylene is an example of

1. Elimination reaction
2. Substitution reaction
3. Addition reaction
4. Condensation reaction

     

ans : c

4.  Conversion of CH4 to CH3Cl is an example of which of the following reaction ?

1. Electrophilic substitution
2. Free radical addition
3. Nucleophilic substitution
4. Free radical substitution

     

ans : d

5. Bromination of alkanes involves

1. Carbanions
2. Carbcations
3. Carbenes
4. Free radicals

     

ans : d