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Practice each question, then open the answer or worked solution.
Match the hydrocarbons in Column I with the boiling points given in Column II.
| Column I
(i) n–Pentane (ii) iso-Pentane (iii) neo-Pentane |
Column II
(a) 282.5 K (b) 309 K (c) 301 K |
(i) is b
(ii) is c
(iii) is a
Match the following reactants in Column I with the corresponding reaction
products in Column II.
(i) is d
(ii) is c
(iii) is b
(iv) is a
Match the reactions given in Column I with the reaction types in Column II.
(i) is d
(ii) is a
(iii) is b
(iv) is c
V. Assertion and Reason Type
In the following questions, a statement of assertion (A) followed by a statement
of the reason (R) is given. Choose the correct option out of the choices given
below each question.
Assertion (A): The compound cyclooctane has the following structural
formula: 
It is cyclic and has conjugated 8π-electron system but it is not
an aromatic compound.
Reason (R) : (4n + 2) π electrons rule does not hold good and the ring is not
planar.
(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct.
(iv) A is not correct but R is correct.
Option (i) is correct.
Assertion (A): Toluene on Friedel Crafts methylation gives o– and p–xylene.
Reason (R): CH3-group bonded to benzene ring increases electron density
at o– and p– position.
(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct.
(iv) A is not correct but R is correct.
Option (i) is correct
Assertion (A): Nitration of benzene with nitric acid requires the use of
concentrated sulphuric acid.
Reason (R): The mixture of concentrated sulphuric acid and concentrated
nitric acid produces the electrophile, NO2+.
(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct.
(iv) A is not correct but R is correct.
Option (i) is correct
Assertion (A): Among isomeric pentanes, 2, 2-dimethylpentane has the highest
boiling point.
Reason (R): Branching does not affect the boiling point.
(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct.
(iv) A is not correct but R is correct.
Option (iii) is correct.
Solve the NCERT Exemplar Class 11 Chemistry Chapter 13 Hydrocarbons to understand the chapter in an easy way.
Hydrocarbons lay a foundation for advanced topics, which you will be learning in the higher classes. If you are planning to take a science- or medical-related course, it is important to get good knowledge on this topic to avoid difficulty in future. For study materials of NCERT Class 11 and Class 12 Science and a comprehensive learning experience, visit BYJU’S website or download BYJU’S – The Learning App.