JEE Main Chemistry question

When the boiling points of the first ten normal alkanes are plotted against the number of carbon atoms, the graph

(A)Is a straight line
(B)Rises steeply at first and then progressively flattens out (a smooth, concave-down increasing curve)Correct
(C)Decreases monotonically
(D)Is a horizontal line

Answer: (B)

Solution

Each additional CH unit adds a roughly similar, but gradually diminishing, increment of van der Waals surface area and hence boiling-point

Create a free account to read the complete working, and practise questions like this in a timed test.

Question ID VK-142611