Previous Year NEET Question- Hydrocarbons L-1

Question: Q.1. The decreasing order of boiling points of the following alkanes is :#

(a) heptane

(b) butane

(c) 2-methylbutane

(d) 2-methylpropane

(e) hexane

Choose the correct answer from the options given below:

A) $(a) $>$ (e) $>$ (c) $>$ (b) $>$ (d)$

B) $(a) $>$ (c) $>$ (e) $>$ (d) $>$ (b)$

C) $(c) $>$ (d) $>$ (a) $>$ (e) $>$ (b)$

D) $(a) $>$ (e) $>$ (b) $>$ (c) $>$ (d)$

Answer: $(a) $>$ (e) $>$ (c) $>$ (b) $>$ (d)$#

Sol:#

• With increase in number of carbons in alkane, boiling point increases
• In case of isomeric alkanes, greater is the number of branches, lesser is the boiling point.