What is the major product in the following reaction ?

Three flasks A, B and C respectively contain 0.1 M, 0.1 m and 0.1 N aqueous HC1
solutions, prepared at 40°C. Considering the density of water = 1 &/CM³ at 4⁰C,
which of the following statements is/are correct ?
a. Concentration of all three solutions is exactly the same.
b. Concentration of HCL in flask A and flask C is exactly the same.
c. Concentration of HCL in flask B is lesser than concentration of HCL in flasks A
and C.
d. No two flasks have HCl of exactly the same concentration.

Match the columns :
Group I                                       Group II
a. Surfadants                            I. Alkylaryl sulphonates
b. Dye intermediates                II. Benzene
c. Lacquers                              III. Cellulose acetate
d. Solvents                               IV. Ethyl acetate
                                                 V. Anthracene

The correct order of increasing stability of carbonium ion is

Which of the following is the best method for preparation of common detergent
sodium dodecyl benzene sulphonate (C) ?

Which chemical is used in seeding clouds for artificial rain