The functional group for an aldehyde is
a. ( - cooh)
b. (- oh)
c. (- coh)
d. (-co)

The functional group of aldehyde is - COH

This group is attached to another carbon chain  giving the hydrocarbons that  contain this functional group  the general formula: R-COH

The functional group gives the aldehydes their chemical properties as it can be displaced during reactions to form new compounds.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2