Structure and Isomerism

Which of these species is anti-aromatic? 

Which of the following compound displays geometrical isomerism?

The compound C₂H₅OC₂H₅ and CH₃OCH₂CH₂CH₃ are 

Which of the following cannot be written in an isomeric form?

Molecular formula ${\mathrm{C}}_3{\mathrm{H}}_6{\mathrm{Br}}_2$ can have (including stereoisomer):

Phenol and benzyl alcohol are 

How many structural formula are possible when one of the hydrogen is replaced by a chlorine atom in anthracene?

C₇H₇Cl shows how many benzenoid aromatic isomers?

The compounds ${\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{OC}}_2{\mathrm{H}}_5 \mathrm{and} {\mathrm{CH}}_3{\mathrm{OCH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$ are:

Which of the following does not show geometrical isomerism?

Of the five isomeric hexanes given below, the isomer which can give exactly two monochlorinated compounds is?

The number of isomers for the compound with molecular formula  $C_{2}BrClFI$ is:

An isomer of ethanol is:

Which of the following compounds will exhibit geometrical isomerism?

Which of the following show chain isomerism :

What is isomer?

Which of the following will show geometrical isomerism.