It is not a condition of fasting being valid that one should pray in congregation

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Check below answers in case you are looking for other related questions:
Is there a specific punishment for looking at adorned women whilst fasting?
Vaccinations against meningitis do not invalidate the fast

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Related Answers:
She did not eat suhoor and did not wake up for Fajr. Should she carry on fasting or break her fast?
He is not sure whether what came out of him whilst he was fasting was madhiy or maniy
Ruling on nose drops for one who is fasting
Is there a specific punishment for looking at adorned women whilst fasting?
Vaccinations against meningitis do not invalidate the fast

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