Which of the following statements is correct regarding the ease of dehydration of alcohols?

Heroin is chemically known as $.........$.

$A$ screen is placed $50 \, cm$ from a single slit, which is illuminated with $6000 \, \mathring{A}$ light. If the distance between the first and third minima in the diffraction pattern is $3 \, mm$, the width of the slit is.....$mm$

$Na_2S + Na_2[Fe(CN)_5NO] \longrightarrow Na_4[Fe(CN)_5NOS]$; what are the oxidation numbers of $Fe$ in the reactant complex and the product complex,respectively?

Which of the following is a single-membrane bound organelle?

If $\cos (A-B)=3/5$ and $\tan A \tan B=2$,then which one of the following is true?