Important Questions for Class 11
Chemistry
Chapter 12 Organic Chemistry Some Basic Principles and
Techniques
Very Short Answer Questions 1 Marks
1. How many and bonds are present in each of the following molecules?
i. HC C C CCH 3
Ans: C C: 4, C H : 4, C C: 4
ii. CH 2 C CHCH 3
Ans: C C:3, C H: 6, C C: 2
2. Why are electrons easily available to the attacking reagents in bonds?
Ans: The electron charge cloud of the bond is located above and below the
plane of bonding atoms. This results in the electrons being easily available to the
attacking reagents.
3. Write the bond line formula for
Ans:
4. How are organic compounds classified?
Ans:
(i) Acyclic or open chain compounds
(ii) Alicyclic or closed chain or ring compounds.
(iii) Aromatic compounds.
Class 11 Chemistry www.vedantu.com 1
, 5. Define homologous series?
Ans: A group or a series of organic compounds each containing a characteristic
functional group forms a homologous series and the members of the series are
called homologous.
6. Write an example of a non-benzenoid compound.
Ans:
7. What is the cause of geometrical isomerism in alkenes?
Ans: Alkene has a bond and the restricted rotation around the bond gives
rise to geometrical isomerism.
8. Name the chain isomers of C5 H 12 which has a tertiary carbon atom.
Ans: 2-Methyl butane (CH3 ) 2 CH CH 2 CH3 .
9. Define heterolytic cleavage.
Ans: In heterolytic cleavage the bond breaks in such a fashion that the shared pair
of electrons remains with one of the fragments.
10. Define carbocation.
Ans: A species having a carbon atom possessing a sextet of electrons and a
positive charge is called carbocation.
11. What are the nucleophiles?
Ans: The electron rich species are called nucleophiles. A nucleophile has
affection for a positively charged centre.
Example- OH ,I ,CN
12. How can the mixture of kerosene oil and water be separated?
Ans: The mixture of kerosene oil and water can be separated by using a separating
funnel.
13. Lassaigne’s test is not shown by diazonium salts. Why?
Class 11 Chemistry www.vedantu.com 2
Chemistry
Chapter 12 Organic Chemistry Some Basic Principles and
Techniques
Very Short Answer Questions 1 Marks
1. How many and bonds are present in each of the following molecules?
i. HC C C CCH 3
Ans: C C: 4, C H : 4, C C: 4
ii. CH 2 C CHCH 3
Ans: C C:3, C H: 6, C C: 2
2. Why are electrons easily available to the attacking reagents in bonds?
Ans: The electron charge cloud of the bond is located above and below the
plane of bonding atoms. This results in the electrons being easily available to the
attacking reagents.
3. Write the bond line formula for
Ans:
4. How are organic compounds classified?
Ans:
(i) Acyclic or open chain compounds
(ii) Alicyclic or closed chain or ring compounds.
(iii) Aromatic compounds.
Class 11 Chemistry www.vedantu.com 1
, 5. Define homologous series?
Ans: A group or a series of organic compounds each containing a characteristic
functional group forms a homologous series and the members of the series are
called homologous.
6. Write an example of a non-benzenoid compound.
Ans:
7. What is the cause of geometrical isomerism in alkenes?
Ans: Alkene has a bond and the restricted rotation around the bond gives
rise to geometrical isomerism.
8. Name the chain isomers of C5 H 12 which has a tertiary carbon atom.
Ans: 2-Methyl butane (CH3 ) 2 CH CH 2 CH3 .
9. Define heterolytic cleavage.
Ans: In heterolytic cleavage the bond breaks in such a fashion that the shared pair
of electrons remains with one of the fragments.
10. Define carbocation.
Ans: A species having a carbon atom possessing a sextet of electrons and a
positive charge is called carbocation.
11. What are the nucleophiles?
Ans: The electron rich species are called nucleophiles. A nucleophile has
affection for a positively charged centre.
Example- OH ,I ,CN
12. How can the mixture of kerosene oil and water be separated?
Ans: The mixture of kerosene oil and water can be separated by using a separating
funnel.
13. Lassaigne’s test is not shown by diazonium salts. Why?
Class 11 Chemistry www.vedantu.com 2
