HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Important Questions for Chemistry

A gas when passed through K₂Cr₂O₇ and dil. H₂SO₄ solution turns it green, the gas is

(A) CO₂

(B) NH₃

(C) SO₂

(D) Cl₂

How is ethanoic acid prepared from dry ice?

Identify A and B in the following reaction:

`CH_3-Br+Mg"dry ether"/""A+CO_2"dry ether"/(H^+/(H_2O))B+Mg(Br)OH`

Write the environmental effects of DDT.

Explain only reaction mechanism for alkaline hydrolysis of tert-butyl bromide

Give balanced equations for the following reactions:

Acetic anhydride with phosphorus pentachloride.

Explain metamerism with suitable examples of ethers

Ethylidene dichloride when boiled with aqueous solution of NaOH yields _______.

(A) formaldehyde

(B) acetaldehyde

(C) acetone

(D) ethyl methyl ketone

Natalite is a mixture of

(a) diethyl ether and methanol

(b) diethyl ether and ethanol

(c) dimethyl ether and methanol

(d) dimethyl ether and ethanol

Which of the following compounds is NOT prepared by the action of alcoholic NI₃ on alkyl halide?

(a) CH₃NH₂

(b) CH₃- CH₂- NH₂

(c) CH₃ - CH₂ - CH₂ - NH₂

(d) (CH₃)₃ C- NH₂

Write the structure and IUPAC name of 'methyl-n-propyl ether'.

What is the action of hot HI on it?

3-Methylbutane-2-ol on heating with HI gives ______

How is phenol converted into the following?

picric acid

Choose the correct option.

Which of the following substrate will give ionic organic products on reaction?

Anisole on heating with concentrated HI gives ______.

Choose the correct option.

Which of the following is the least acidic compound?

Answer in one sentence/ word.

Write the name of the electrophile used in Kolbe’s Reaction.

Write two points of difference between the properties of phenol and ethyl alcohol.

Write structural formula for pentane-1,4-diol.