Which of the following statements is not true?

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Boron is a nonmetal while all other elements of Group 13 are metals

Boron trichloride acts as a Lewis acid

Boron does not form the hydrated $B^{3 +}$ ion

The stability of the +1 oxidation state decreases down the group whereas that of +3 increases

answer is D.

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Detailed Solution

The stability of the + 1 oxidation state increases down the group. This is because of the participation of only p electron. The two s-electrons ( $s^{2}$ ) do not take part in the chemical reaction (inert pair effect).

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