The names of these constitutional isomers are cyclopentane, methylcyclobutane, ethylcyclopropane, and 1,1-dimethylcyclopropane.
Constitutional isomers have the same molecular formula. This means that they have the same number of carbon and hydrogen atoms, with a general formula of:

When we consider the possible structures, the first option is cyclopentane, the simplest five-membered ring. When we reduce the ring to four carbons, we have the methylcyclobutane and when we reduce it to three carbons, we can arrange the other two carbons in an ethyl group or we can put two methyl groups on a single carbon atom to get the final two constitutional isomers.
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Moles of oxygen = 22g / 32 (Mr of O2)
Moles of oxygen = 0.7 moles (1 dp)
Avogadro's constant = 6.02×10^23 particles per mole
0.7 moles×(6.02×10^23) = Answer
This is assuming it wants O2, if it wants pure oxygen then replace 32 with 16.
Synthesis reaction or combination reaction
The conditions given are stp or standard temperature and pressure. This would be considered the substance's standard state.