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The hydrocarbon pentane, C 5 H 12 , and the highly polar acetonitrile, CH 3 CN,

ID: 486967 • Letter: T

Question

The hydrocarbon pentane, C5H12, and the highly polar acetonitrile, CH3CN, are two immiscible organic solvents. A mixture of a hydrocarbon, R-H, and of an alcohol, R-OH, can be separated by partitioning between pentane and acetonitrile. In this experiment:

The hydrocarbon ends up in the acetonitrile phase and the alcohol in the pentane phase

The hydrocarbon ends up in the pentane phase and the alcohol in the acetonitrile phase

Both the hydrocarbon and the alcohol end up in the pentane phase

Both the hydrocarbon and the alcohol end up in the acetonitrile phase

a.

The hydrocarbon ends up in the acetonitrile phase and the alcohol in the pentane phase

b.

The hydrocarbon ends up in the pentane phase and the alcohol in the acetonitrile phase

c.

Both the hydrocarbon and the alcohol end up in the pentane phase

d.

Both the hydrocarbon and the alcohol end up in the acetonitrile phase

Explanation / Answer

"Like dissolves like" i.e.- polar dissolves polar and non polar dissolves non polar.

since pentane is nonpolar in nature during partitioning experiment the hydrocarbon partitioned in to pentane and the polar alcohol partitioned into acetonitrile.

Ans- b. The hydrocarbon ends up in the pentane phase and the alcohol in the acetonitrile phase