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Both Assertion and Reason are correct and reason is the correct explanation of Assertion

Both Assertion and Reason are correct and reason is NOT the correct explanation of Assertion

Assertion is correct but the reason is INCORRECT

Both Assertion and Reason are INCORRECT

answer is B.

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Detailed Solution

Assertion -1 is True, reason -2 is True, reason -2 is NOT a correct explanation for Assertion -1

${BH}_{3}$ and $B_{2} H_{6}$ both are electron deficient molecule

Back bonding does not take place in ${BH}_{3}$ because H does not have a lone pair of electrons. In other words, boron's electron shortage persists and ${BH}_{3}$ is not present. When there is an electron shortage, ${BH}_{3}$ dimerizes to generate $B_{2} H_{6}$ . Hence boron hydride exists in dimeric form and known as diborane.

Hence correct option is B.

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