Which one of the following pairs represents stereoisomerism?

(a)

Chain isomerism and rotational isomerism.

(b)

Structural isomerism and geometrical isomerism

(c)

Linkage isomerism and geometrical isomerism.

(d)

Optical isomerism and geometrical isomerism

The correct order of increasing bond length of C-H, C-O, C-C, and C = C is _________

(a)

C-H < C-O < C-C < C=C

(b)

C-H < C=C < C-O < C-C

(c)

C-C < C=C < C-O < C-H

(d)

C-O < C-H < C-C < C=C

Assertion (A): C₂ Dr CI FI can farm 6 different geometrical isomers.
Reason (R):  Each one structure is geometrical isomer of other five structures.
Codes:
(a) Both A and Rare true and Ris correct explanation of A
(b) Both A and R are true but R is not correct explanation of A.
(c) A is true but R is false
(d) Both A and R are false.

(a)

Both A and Rare true and Ris correct explanation of A

(b)

Both A and R are true but R is not correct explanation of A.

(c)

A is true but R is false

(d)

Both A and R are false.

Compounds having boiling points widely apart 40k and above can be purified by________.

(a)

Crystallisation

(b)

Sublimating

(c)

Fractional distillation

(d)

Simple distillation

Purification of two miscible liqulds possessing very close boiling points can be separated using _________

(a)

Fractional distillation

(b)

Sublimation

(c)

Simple distillation

(d)

Steam distillation