Science (English Medium) Class 12 - CBSE Question Bank Solutions

Match the example given in Column I with the name of the reaction in Column II.

	Column I (Example)		Column II (Reaction)
(i)	\[\begin{array}{cc} \phantom{...}\ce{O}\phantom{..............................}\ce{O}\phantom{}\\ \phantom{...}||\phantom{..............................}||\phantom{}\\ \ce{CH3 - C - Cl + H2 ->[Pd - C/BasO4] CH3 - C - H} \end{array}\]	(a)	Friedel Crafts acylation
(ii)		(b)	HVZ reaction
(iii)		(c)	Aldol condensation
(iv)	\[\begin{array}{cc} \ce{R - CH2 - COOH ->[Br/Red P] R - CH - COOH}\\ \phantom{.....................}|\\ \phantom{.......................}\ce{Br} \end{array}\]	(d)	Cannizaro’s reaction
(v)	\[\ce{CH3 - CN ->[(i) SnCl2/HCl][(ii) H2O/H+] CH3CHO}\]	(e)	Rosenmund’s reductio
(vi)	\[\ce{2CH3CHO ->[NaOH] CH3 - CH = CHCHO}\]	(f)	Stephen’s reaction

An alkene ‘A’ (Mol. formula \[\ce{C5H10}\]) on ozonolysis gives a mixture of two compounds ‘B’ and ‘C’. Compound ‘B’ gives positive Fehling’s test and also forms iodoform on treatment with \[\ce{I2}\] and \[\ce{NaOH}\]. Compound ‘C’ does not give Fehling’s test but forms iodoform. Identify the compounds A, B and C. Write the reaction for ozonolysis and formation of iodoform from B and C.

An aromatic compound ‘A’ (Molecular formula \[\ce{C8H8O}\]) gives positive 2, 4-DNP test. It gives a yellow precipitate of compound ‘B’ on treatment with iodine and sodium hydroxide solution. Compound ‘A’ does not give Tollen’s or Fehling’s test. On drastic oxidation with potassium permanganate it forms a carboxylic acid ‘C’ (Molecular formula \[\ce{C7H6O2}\]), which is also formed along with the yellow compound in the above reaction. Identify A, B and C and write all the reactions involved.

Which of the following should be most volatile?

A compound Z with molecular formula \[\ce{C3H9N}\] reacts with \[\ce{C6H5SO2Cl}\] to give a solid, insoluble in alkali. Identify Z.

Assertion: N-Ethylbenzene sulphonamide is soluble in alkali.

Reason: Hydrogen attached to nitrogen in sulphonamide is strongly acidic.

Can nucleic acids, proteins and starch be considered as step growth polymers?

Which statement about aspirin is not true.

The compound that causes general antidepressant action on the central nervous system belongs to the class of ______.

Equanil is ______.

Which of the following statements are correct about barbiturates?

(i) Hypnotics or sleep producing agents.

(ii) These are tranquilizers.

(iii) Non-narcotic analgesics.

(iv) Pain reducing without disturbing the nervous system.

Veronal and luminal are derivatives of barbituric acid which are:

(i) Tranquilizers

(ii) Non-narcotic analgesic

(iii) Antiallergic drugs

(iv) Neurologically active drugs

Write the uses of medicines.

Which class of drugs is used in sleeping pills?

What are analgesics?

Which analgesics are called opiates?

What is the medicinal use of narcotic drugs?

With the help of an example explain how do tranquilizers control the feeling of depression?

How would you account for the following:

There is a greater range of oxidation states among the actinoids than among the lanthanides.

Account for the following:

N-ethylethanamine boils at 329.3 K and butanamine boils at 350.8 K, although both are isomeric in nature.