Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

Which is the correct increasing order of boiling points of the following compounds?

1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane

Which is the correct increasing order of boiling points of the following compounds?

1-Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene

Out of o-and p-dibromobenzene which one has higher melting point and why?

Which of the following compounds will have the highest melting point and why?

(I)
(II)
(III)

Assertion: The boiling points of alkyl halides decrease in the order:

RI > RBr > RCl > RF

Reason: The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.

The correct increasing order of basic strength for the following compounds is ______.

(I)

(II)

(III)

The correct decreasing order of basic strength of the following species is ______.

\[\ce{H2O, NH3, OH-, NH^{-}2}\]

Explain why \[\ce{MeNH2}\] is stronger base than \[\ce{MeOH}\]?

Which of the following statements is not true about low-density polythene?

Out of chain growth polymerisation and step growth polymerisation, in which type will you place the following.

What is the role of benzoyl peroxide in addition polymerisation of alkenes? Explain its mode of action with the help of an example.

Why should the monomers used in addition polymerisation through free radical pathway be very pure?

Match the polymer of column I with correct monomer of column II.

Match the polymers given in Column I with their chemical names given in Column II.

Match the polymers given in Column I with the preferred mode of polymerisation followed by their monomers.

Assertion: Olefinic monomers undergo addition polymerisation.

Reason: Polymerisation of vinyl chloride is initiated by peroxides/ persulphates.

Assertion: Polytetrafluoroethene is used in making non-stick cookwares.

Reason: Fluorine has highest electronegativity.

Low density polythene and high density polythene, both are polymers of ethene but there is marked difference in their properties. Explain.

Which of the following statements is not correct.

A narrow spectrum antibiotic is active against ______.