What is trihydroxy propane?

Identify the saturated and unsaturated fatty acids from the following list:
$I-$ Acetic acid,$II-$ Methanoic acid
$III-$ Arachidonic acid,$IV-$ Palmitic acid
$V-$ Stearic acid,$VI-$ Oleic acid
Select the correct grouping for Saturated fatty acids and Unsaturated fatty acids.

What does a trihydroxy alcohol contain?

Which of the following does not contain carbohydrates?

Which of the following is not a type of lipid?

Match the lipids given in Column-$I$ with their occurrence in Column-$II$.

Column-$I$	Column-$II$
$i$. Cerebrosides	$a$. Most of the cells in animal body
$ii$. Waxes	$b$. Dioscorea
$iii$. Diosgenin	$c$. Myelin sheath
$iv$. Cholesterol	$d$. Sebaceous glands of the skin