Doubt from goc

Can we compare two aromatic compounds , like which one is more stable

6,7,8

1st is more stable as it has more conjugated e- and strain is also less compared to 2nd

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Question 7 B
CH bond is weaker

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Question 6 A

So similary can we say CT>CD>CH in bond strength ?but how you are comparing bonds strength

Answer is given B for 6

The order was just told us I don’t any reason why

15

Option B question 15

Answer is given C for15
Maybe answers can be incorrect, as in himanshu pandey many are wrong
Can you tell your method

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YEs this is what I did.

I seem to understand why this is true.
D has more nuclear mass than H thus more inter nuclear attraction with other atoms thus making CD more stable than CH bond.

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