Question

Q6. Fill in the blanks in the following senetecnes with appropriate words/terms I. Addition polymerization occurs between molecules containing -------------bonds II. The polymer formed from two or more different kinds of monomeric units is known as ------- III. The polymers formed by the radical polymerization are mostly ------------polymer IIII. The molecules of cyclohexane mostly exist in the --- -------conformation. V. The optical activity of a compound is measured by زر

Answer 1

6.

I.

Addition polymerization requires forming the bonds of a polymer by using electrons from a double bond. So, addition polymerization occurs between molecules containing double bonds.

II.

Polymers formed from two or more different kinds of monomers are called copolymers.

Additionally: if the different monomeric units alternate, them they are called alternating copolymers. If all the monomeric units of one type are present together, followed by another "block" of another type of monomeric unit, then it's called block copolymer. If there's no pattern of occuring of the monomers, then they're called random copolymers.

III .

The polymers formed by radical polymerization are mostly branched polymers.

Branching occurs in free radical polymerization as a result of chain transfer process. This happens when an intermediate radical formed during the propagation process moves to another location by H transfer. This helps in the formation of more stable secondary and tertiary radicals.

Also, in radical polymerization, polymers of various lengths are obtained. Since the length of the polymer is dependent upon when the chain termination reaction will occur, and the process of the termination reaction depends upon the probability of colliding with a terminating radical, this leads to different lengths of the polymers .

IIII

The chair conformation of cyclohexane is the most stable with least energy and least steric repulsion. So , molecules of cyclohexane generally exist in chair conformation.

V.

Optical activity is a measure of how much the compound can rotate the plane polarised light. Optical activity can be measured using a polarimeter.