Chemistry and Physics. : 127 
Part 2d. Aromatic series, 
Benzol. 
I, 
The action of the hydracid in this case depends upon its aon 
ae the quantity employed. Benzol heated to 280° for 24 
80 times its weight of a solution of iodhydrie acid baie 
in ia the cold is almost completely converted into hydrid of hexylene: 
O,.H, +iH,—C, Ho. or C,2H,+sHI=C,H,,+4I,. 
A trace of hydrid of propylene is formed at the same time: 
H,+5H,—2C,H,. 
When one part of bonsol is heated to 280° C. with 15-20 parts of 
the — this reaction is different and is represented by the 
equatio 
C,,.H,+3HI=C,H,+3C0,H+I,. 
The chlorinated derivatives of hhensbi yield with the hydracid ben- 
zol, which in its turn with a large excess of the acid gives hydrid 
of “ner 
ike manner reproduces benzol with a small quantity 
of the hydraci, and hydrid of propylene with a larger quantity. 
oluol series 
Toluol when hektod with an excess of the hydracid is completely 
converted into hydrid of heptylene 
GC, A, AiO 
But the total or is expressed by the ejetis 
H,+12HI=C,,H,,+2H 
2+ 2° 
With a wale quantity of the hydracid toluol vias carbon and 
hydrid of “% 
pent acid. "The ee by the Sp wna us decom sition of the 
by the equation 
Wi Vig 60,+7H,=C,,H,,+2H, 
pir a less quay of hydracid benzoic acid: Juke benzol and 
toluol, of which the latter only represents the normal reaction. 
ein hitter almonds with a acid = toluol and wa- 
quantities of benzol and xylol, the formation of 
r leaves Pete 
C umol, xylol and cymol. 
acta! (from coal hey heated with the hydracid yields hydrid of 
4H,=C,;H,., 
With a less aan of t the rs hydrid of ee is formed: 
Xv H,,.+6HI=2C,H,+3C,+H, 
Ylol in tke behicias appears to yield hydrid of Sarr of Ci Hie 
Cymol (from coal tar) yields hydrid of decylene: 
