Assertion : $C H_{3} N H_{3}^{+} - C H_{3} N H_{2}$ is a conjugate acid base pair. Reason: $H_{3} O^{+}$ , $O H^{-}$ is a conjugate acid base pair.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Conjugate acid and conjugate base differ in one proton only.
$C H_{3} N H_{3}^{+}, C H_{3} N H_{2}$ is a conjugate acid-base pair.
$H_{3} O^{+}, H_{2} O$ is a conjugate acid-base pair.
$H_{2} O, O H^{-}$ is a conjugate acid-base pair.
Hence, assertion is correct but Reason is incorrect.

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Assertion :CH3NH+3−CH3NH2 is a conjugate acid base pair. Reason: H3O+, OH− is a conjugate acid base pair.

Assertion : $C H_{3} N H_{3}^{+} - C H_{3} N H_{2}$ is a conjugate acid base pair. Reason: $H_{3} O^{+}$ , $O H^{-}$ is a conjugate acid base pair.