The stereoisomers that are formed by electrophilic addition of bromine to trans$-$but$-2-$ene is/are:

The correct statement$(s)$ about the compound $\mathrm{H}_3 \mathrm{C}(\mathrm{HO}) \mathrm{HC}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}(\mathrm{OH}) \mathrm{CH}_3(\mathbf{X})$ is(are)

$(A)$ The total number of stereoisomers possible for ${X}$ is $6$

$(B)$ The total number of diastereomers possible for ${X}$ is $3$

$(C)$ If the stereochemistry about the double bond in ${X}$ is trans, the number of enantiomers possible for ${X}$ is $4$

$(D)$ If the stereochemistry about the double bond in ${X}$ is cis, the number of enantiomers possible for ${X}$ is $2$

Chiral molecule is

The following molecule is fluorometholone a steroidal anti-inflammatory agent.  How many stereogenic centers does it contain ?

How many carbon atoms in the molecule $HCOO - {(CHOH)_2} - COOH$ are asymmetric

$L$-isomer of tetrose $X \left( C _4 H _8 O _4\right)$ gives positive Schiff's test and has two chiral carbons. On acetylation. ' $X$ ' yields triacetate. ' $X$ ' also undergoes following reactions

$' A ^{\prime} \stackrel{ HNO _3}{\longrightarrow} X ^{\prime} \stackrel{ NaBH _4}{\longrightarrow} \underset{\text { Chiral compound }}{\text { } B ^{}}$ $X$ is $.......$.