Home » Ask & Discuss » Chemistry
« Back to Discussion

Organic Chemistry

Cool goIITian

Joined:	3 Nov 2006
Post:	88

7 May 2007 11:35:06 IST

0 People liked this

972

boiling point

Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Chemistry , Organic Chemistry

Which has a higher boiling point hexane or heptane?

Comments (9)

Divya Alok Gupta

Blazing goIITian

Joined: 6 Feb 2007

Posts: 369

7 May 2007 11:41:04 IST

Like 1 people liked this

both will have nearly equal boiling point it is melting point on which there s a concept...in case of alkanes!!!!also there is no H bonding or any other type of interactions which are present only in one of the substrates basicallly they are similar in interacting with other species and thier own species !!!!! Only the size is slightly different so expectedly heptane has more BP than hexane

Shagun Singhal

Scorching goIITian

Joined: 26 Feb 2007

Posts: 220

7 May 2007 12:05:05 IST

Like 1 people liked this

heptane has higher b.p 'coz its m.mass is more than hexane.

In case of m.p, the concept is that the alkanes with even no. of carbon atoms have more m.p than the adjacent alkanes having odd no. of carbon atoms.

Divya Alok Gupta

Blazing goIITian

Joined: 6 Feb 2007

Posts: 369

7 May 2007 12:14:30 IST

Like 0 people liked this

hey beckham man i wrote the same thing!!!!

Shagun Singhal

Scorching goIITian

Joined: 26 Feb 2007

Posts: 220

7 May 2007 12:26:21 IST

Like 0 people liked this

yaar Tanuj, sorry if you meant the same thing. I will give a 2 pointer to you then.
But, your reply wasn't clear to me after the first line.

Taher Saifuddin

Cool goIITian

Joined: 7 Apr 2007

Posts: 54

7 May 2007 12:42:54 IST

Like 0 people liked this

lol , both of u missed a small point that heptane has a higher boiling point not only because of its molar mass but becuase the molecule is bigger and has a greater surface area, as a result the Wan der Waals interactions(attractive) are more and hence it has a higher bp.

Madhusudan Chavan

Forum Expert

Joined: 9 Mar 2007

Posts: 2801

7 May 2007 18:56:51 IST

Like 0 people liked this

11889

The boiling points of alkanes rise fairly regularly as the number of carbon atoms in the compound increase. This holds good only for normal compounds, and the difference in b.p.s decreases as the higher homologues are reached.

n-hexane (b.p.69⁰c) ,n-heptane (b.p. 98⁰c)

Karthik M

Blazing goIITian

Joined: 1 May 2007

Posts: 2830

8 May 2007 19:54:34 IST

Like 0 people liked this

Heptane has higher bpt, because of its higher molecular weight, which enhance the Vander waal's forces of attraction between the atoms.

Taher Saifuddin

Cool goIITian

Joined: 7 Apr 2007

Posts: 54

9 May 2007 11:49:02 IST

Like 0 people liked this

lol they r molecules not atoms!

Divya Alok Gupta

Blazing goIITian

Joined: 6 Feb 2007

Posts: 369

9 May 2007 11:55:12 IST

Like 0 people liked this

Its all right i am sure he meant molecules only .................

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team