Question

Statement-I: Melting point of neopentane is greater than that of n-pentane.
Statement-II: Neopentane gives only one mono-substituted product.

• A. Both S-I and S-II are correct
• B. Both S-I and S-II are incorrect
• C. S-I is incorrect but S-II is correct
• D. S-I is correct but S-II is incorrect

Hint:

When considering the physical properties of isomers like neopentane and n-pentane, remember that the structure influences properties like melting point and boiling point. Also, consider the symmetry when predicting the number of substitution products.

Answer 1

The Correct Option is D

- Statement-I: The melting point of neopentane is indeed higher than that of n-pentane because the structure of neopentane is more compact, and hence, the intermolecular forces are stronger, leading to a higher melting point. Therefore, Statement-I is correct. 

- Statement-II: Neopentane can give more than one mono-substituted product because it has multiple possible positions for substitution. Thus, Statement-II is incorrect. Hence, the correct option is (4), as Statement-I is correct, but Statement-II is incorrect.