Highest calories are obtained from:

Consider the following four statements $(a-d)$ and select the option which includes all the correct ones only $:-$
$(a)$ Lipids are generally water insoluble.
$(b)$ The $R$ group could be a methyl $(-CH_3)$ or ethyl $(-C_2H_5)$ or higher number of $-CH_2$ groups ($1$ carbon to $19$ carbons) in fatty acids.
$(c)$ Palmitic acid has $16$ carbons including the carboxyl carbon.
$(d)$ Arachidonic acid has $21$ carbon atoms including the carboxyl carbon.

Group of substances with greasy consistency and a long chain of hydrocarbons containing $C$,$H$,and $O$,where the hydrogen to oxygen ratio is greater than $2:1$,are called:

The component with the highest energy content is ...

How many alcohol groups are typically present in the structure of glycerol?

Phospholipids are: