Starting from `SiCl_4` prepare the following in steps not exceeding the number give in parantheses ( give reaction only )
a. Silicon (1)
b. Linear silicone containing methyl groups only (4)
c. `Na_2 SiO_3 (3) `.

Find the number of positive integers not exceeding 100 which are divisible by 2 or 3 but not by 4. (a) 40 (b) 58 (c) 42 (d) 43

Give reasons for the following (a) C Cl_(4) is immiscible in water, whereas SiCl_(4) is easily hydrolysed. (b) Carbon has a strong tendency for catenation compared to silicon.

which of the following molecules are absorbed by only passive transport in small intestine? 1) glucose 2) amino acids 3) Na^+ ions 4) water

If a_n= the digit at units palce in the number o 1!+2!+3!+……….n! for nge4 the a_4, a_5, a_6, ……… are in (A) A.P. only (B) G.P. only (C) A.P. and G.P. only (D) A.P., G.P. and H.P.

Let A = {1, 2, 3} . Then number of equivalence relations containing (1, 2) is (A) 1 (B) 2 (C) 3 (D) 4

Let A = {1, 2, 3} . Then number of equivalence relations containing (1, 2) is (A) 1 (B) 2 (C) 3 (D) 4

Which of the following on treatment with hot concentrated acidified KMnO_4 gives 2 - methylhexane -1,6 - dioic acid the only organic product ?

Silicones are synthetic polymers containing repeated R_2 SiO units . Since the empirical formula is that of a ketone (R_2 CO) , the name Silicone has been given to these materials . Silicone can be made into oils , rubbery elastomers and resins . They find a variety of applications because of their chemical inertness , water repelling nature, heat resistance and good electrical insulating property . Commerically silicon polymers are usually synthesised by the hudrolysis of R_2 SiCl_2 [R = Methyl (Me ) or phenyl ( phi)] . If we start with SiMeCl_3 as the starting material silicones formed is :

Give the products of the reaction with conc. H_(2)SO_(4) of : a. b. c. d. 1- Methyl cyclohexanol

Give the products formed by the oxidation of hot KMnO_(4) . a. Cyclobutene b. 1- Methyl cyclobutene c. 1,2- Dimethyl cyclobutene