Hydrocarbons

In bromination of Propyne, with Bromine 1, 1, 2, 2-tetrabromopropane is obtained in 27% yield. The amount of 1, 1, 2, 2- tetrabromopropane obtained from 1g of Bromine in this reaction is_______________* 10^-1g. (Nearest integer) (Molar mass: Bromine = 80g / mol)

13.26. Assertion: Out of staggered and the eclipsed conformations of ethane, staggered conformation is more stable. 

Reason: Hydrogen atoms are farthest apart in staggered conformation.

13.20. How would you convert the following compounds into benzene?
(i) Ethyne (ii) Ethene (iii) Hexane.

13.4. Write IUPAC names of the products obtained by the ozonolysis of the following compounds:
(i) Pent-2-ene (ii) 3, 4-Dimethylhept-3-ene (iii) 2-Ethylbut-l-ene (iv) 1-Phenylbut-l-ene.

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.