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Which of the following is correct in the...

Which of the following is correct in the context of sodium stearate, `CH_(3)(CH_(2))_(16)COO^(-)Na^(+)` .

A

It is a major component of many bar soaps

B

The `-COO^(-)` group is the polar-ionic head and is hydrophilic

C

The `R-`group is the nonpolar- tail and is hydrophobic

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
D
When dissolved in water, sodium stearate dissociates into `RCOO^(-)` and `Na^(+)`inos. However, the `RCOO^(-)` inos consist of two parts-a long hydrocarbon chain `R` (also called non-polar tail) which is hydrophobic (water repelling) and a polar group `COO^(-)` (also called polar-ionic head) which is hydrophilic (water loving).
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