Stability of the +1 oxidation state down group 13 (inert pair effect)

1. A.
   Both A and R are correct and R is the correct explanation of A
2. B.
   A is not correct but R is correct
3. C.
   Both A and R are correct but R is NOT the correct explanation of A
4. D.
   A is correct but R is not correct

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1. A.
   $Al < Ga < In < Tl$
2. B.
   $Tl <$ In $< Ga < Al$
3. C.
   $Al < Ga < Tl < In$
4. D.
   $Al < Tl < Ga < In$

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1. A.
   Statement I is incorrect but Statement II is correct
2. B.
   Both Statement I and Statement II are correct
3. C.
   Both Statement I and Statement II are incorrect
4. D.
   Statement I is correct but Statement II is incorrect

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1. A.
   Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
2. B.
   $A$ is true but $R$ is false.
3. C.
   Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$.
4. D.
   $A$ is false but $R$ is true.

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