HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

Major product of the following reaction is _______________

\[\ce{CH3-CH2-Mg-Br + NH3 ->?}\]

Nucleophilic substitution reaction of 2, 4-dinitrochlorobenzene is faster than p-nitrochlorobenzene. Give reason.

An octahedral void is surrounded by ________.

The coordination number of spheres in the hcp lattice in three dimension is ______.

Write the correct order of increasing ease of dehydrohalogenation.

\[\ce{\underset{\text{(I)}}{CH3 - CH2 - CH2 - Cl}}\]

\[\ce{\underset{\text{(II)}}{CH3 - CH(Cl) - CH3}}\]

\[\begin{array}{cc}
\ce{CH3}\\
|\\
\ce{CH3-C-Cl}\phantom{...}\\
|\\
\ce{CH3}\\
\ce{(III)}
\end{array}\]

Explain. Aryl halides are less reactive than alkyl halides towards nucleophilic substitution reactions.

The number of tetrahedral voids are formed if the number of atoms in a crystal is N/2.

Explain primary benzylic halide shows higher reactivity by S_N1 mechanism than other primary alkyl halide.

The number of octahedral voids formed in 0.5 mol of a compound forming hcp structure?

Explain the factors affecting S_N1 and S_N2 mechanism.

Explain aqueous alkaline hydrolysis of tert. butyl bromide.

The colligative properties of solutions _______.

What is dehydrohalogenation? State the rule for the formation of the preferred product of dehydrohalogenation.

Which of the following pair of reagent is used for conversion of carboxylic acid to alcohol?

What is the pOH if the hydrogen ion concentration in solution is 1 × 10^–3 mol dm^–3?

Calculate the pOH of 10^-8 M of HCl.

Calculate the pH and pOH of 0.0001 M HCl solution.

Compound ‘A’ with molecular formula C₆H₅Cl is fused with NaOH at high temperature under pressure to give compound ‘B’. Compound ‘B’ on treatment with dil.HCl gives compound C having characteristic carbolic odour. Write the chemical equations in support of this. Name the process and give uses of compound C.

Define pOH.

Derive the equation p^H + p^OH = 14.