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1- Central nervous system, thalamus.

2- Because the hypothalamus is part of an unit called Hypothalamus - adeno/neuro hypophysis, that unit synthesizes hormones.  

3- Through different cores like supraoptic, paraventricular, etc.

4- Specific hormones (polypeptides, proteins, derived from amino acids, steroids). Those hormones travel in arterias or veins to the diana organs.

5- pituitary gland/ hypophysis

Explanation: -

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds