Which pigment is water-soluble?

The parallel layering of membranes in chloroplast is suited for

Which molecule acts as the reaction center in photosynthesis?

Which chlorophyll molecule does not possess a phytol tail?

Which of the following are accessory pigments for photosynthesis?

Analogy type question:
$(1)$ Chlorophyll-$a$ : Blue-green color :: Chlorophyll-$b$ : .......
$(2)$ Chlorophyll-$a$ molecule in $PS-I$ : Absorption of $700 \,nm$ wavelength :: In $PS-II$ : .......