A polymer is a large chemical compound composed of smaller repeating units --- over & over & over again. Like a long choo-choo train is made up of smaller connected, repeating, choo-choo cars. The chemical process that connectsthe smaller subunits to form large organic compounds is called dehydration synthesis.
http://www.hobart.k12.in.us/jkousen/Biology/biochem.htm
The unique properties of water are largely due to the strong hydrogen bonding that occurs between its molecules. In the following diagram the hydrogen bonds are depicted as magenta dashed lines. The molecule providing a polar hydrogen for a hydrogen bond is called a donor.
https://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/physprop.htm
The simplest is the molecular formula, which tells you the number of atoms of each element present in a compound. An empirical formula is basically a molecular formula with the numbers of atoms shown in the smallest possible ratio.
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When a hydrogen atom is part of a polar covalent bond to a more electronegative atom such as oxygen, its small size allows the positive end of the bond dipole (the hydrogen) to approach neighboring nucleophilic or basic sites more closely than can components of other polar bonds.
https://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/physprop.htm
All atoms and molecules have a weak attraction for one another, known as van der Waals attraction. This attractive force has its origin in the electrostatic attraction of the electrons of one molecule or atom for the nuclei of another.
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The miscibility of other liquids in water, and the solubility of solids in water, must be considered when isolating and purifying compounds. To this end, the following table lists the water miscibility (or solubility) of an assortment of low molecular weight organic compounds.
https://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/physprop.htm
To keep it simple, remember it this way: organic compounds always contain carbon and hydrogen (and maybe some other elements), inorganic compounds do not contain carbon and hydrogen together. Organic compounds are found in living things, their wastes, and their remains.
http://www.hobart.k12.in.us/jkousen/Biology/biochem.htm
Again, organic just means the compound contains carbon & hydrogen together. In the case of lipids, the compounds contain C, H, & O, and that's it. No other elements in lipid molecules. Nada, none, zippo, zilch.
http://www.hobart.k12.in.us/jkousen/Biology/biochem.htm
1 The molecular formula tells us that there are 6 carbon atoms, 12 hydrogen atoms, & 6 oxygen atoms in one single glucose molecule. 2  Notice that if you look at the structural formula & tally up each letter (element) you get the molecular formula.
http://www.hobart.k12.in.us/jkousen/Biology/biochem.htm
Other compounds in each row have molecular dipoles, the interactions of which might be called hydrogen bonding, but the attractions are clearly much weaker. The first two hydrides of group IV elements, methane and silane, are listed in the first table above, and do not display any significant hydrogen bonding.
https://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/physprop.htm
what bond must a molecular compound contain
Hydrogen bond contains a molecular compound. A molecular compound must contain hydrogen bond.