Assertion : $(S i H_{3})_{3} N$ is weaker base than $(C H_{3})_{3} N$ . Reason: $(S i H_{3})_{3} N$ is planar while $(C H_{3})_{3} N$ is pyramidal.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$(S i H_{3})_{3} N$ is weaker base than $(C H_{3})_{3} N$ .
$(S i H_{3})_{3} N$ is planar while $(C H_{3})_{3} N$ is pyramidal and $C H_{3}$ group is a electron releasing group which increases the electron density at nitrogen so $(C H_{3})_{3} N$ stronger than $(S i H_{3})_{3} N$ .
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Hence option A is correct.

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Assertion :(SiH3)3N is weaker base than (CH3)3N. Reason: (SiH3)3N is planar while (CH3)3N is pyramidal.

Assertion : $(S i H_{3})_{3} N$ is weaker base than $(C H_{3})_{3} N$ . Reason: $(S i H_{3})_{3} N$ is planar while $(C H_{3})_{3} N$ is pyramidal.