Spin only magnetic moment of [MnBr₆]^4$$-$$ is _________ B.M. (round off to the closest integer)

For the reaction given below :

CoCl₃ . xNH₃ + AgNO₃ (aq) $$\to$$

If two equivalents of AgCl precipitate out, then the value of x will be _____________.

The number of chiral alcohol(s) with molecular formula C₄H₁₀O is ________.

In the given reaction,

the number of sp² hybridised carbon(s) in compound 'X' is ________.