Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

Consider the following chemical reaction.

$HC\equiv CH\underset{2)CO,HCl,AlC{l}_3}{\overset{1)RedhotFetube,873K}{\to }}Product$            

The number of sp² hybridized carbon atoms (s) present in the product is--------------.

Assertion (A): Among isomeric pentanes, 2, 2-dimethylpentane has 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.

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.

Assertion (A): Toluene on Friedal 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.

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 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.

Match the reactions given in Column I with the reaction types in Column II.

Match the following reactants in Column I with the corresponding reaction products in Column II.

Match the hydrocarbons in Column I with the boiling points given in Column II.

Match the reagent from Column I which on reaction with 

CH₃ – CH=CH₂ gives some product given in Column II as per the codes given below:

The molecules having dipole moment are __________. 

(i) 2,2-Dimethylpropane 

(ii) Trans-Pent-2-ene 

(iii) Cis-Hex-3-ene 

(iv) 2, 2, 3, 3 - Tetramethylbutane.