352 Mr. Gervaise Le Bas on the 



Aromatic Compounds at the Critical Point, 



M.V. C 6 H B 256-3 -h30 = 8-54 



C 6 H 12 306-7 -^36 = ^-52 



o 



Ho 50-4 



H = 8 40. (Paraffin H 967.) 

 C 6 = VC 6 H 6 -V3H 2 = 256-3-50-4 = 205-9, 

 Thus = 34-3 = 4x8-57. (Paraffin 38'6.) 



The formation of the ring has the effect of compressing the 

 atoms while preserving their characteristic relative volumes. 



The volume of benzene C 6 H 6 should thus differ from that 

 of dipropargyl, C 6 H 6 , an open chain compound, by a large 

 amount, since the constitutions of 



, CH 

 // \ 



CH CH 



| |j and CH == C - CU 2 • CH. ~ = CH 



CH CH 



^ / 

 CH 



differ considerably. 



Volume of Hexane, CH 3 . CH 2 . CH 2 . CH„ . CH., . CH 3 ... 139-93 



753 

 Hexykne, CH 2 : CH . CH 2 . CH 2 . CH, . CH 3 ... 1324 



2x6-97 

 Diallvl, CHo : CH . CH 2 . CH 2 . CH :CH 2 ... 126-1 



6x7-4 

 „ Dipropargyl, CH ; C . CHo . CH 2 . C |CH... 110-3 



Volum of Benzene, C 6 H 6 96 



Contraction -143 



There is a very considerable contraction of — 14'3 at the 

 normal B.P, for Ping structure in the Benzene nucleus. 

 This is not due to unsaturation but to a very considerable 

 compression of the atoms, due no doubt to mutual attractions 

 ,<?£ the carbons. 



