Compound A treated with NaNH₂ followed by CH₃CH₂Br gave compound B. Partial hydrogenation of compound B produced compound C, which on ozonolysis gave a carbonyl compound D, (C₂H₅O). Compound D did not respond to the iodoform test with I₂/KI and NaOH. Find out the structures of A, B, C and D.

The volume of ethyl alcohol (density 1.15 g/cc) that has to be added to prepare 100 cc of 0.5 M ethyl alcohol solution in water is

• 1.15 cc

• 2 cc

• 2.15 cc

• 2.30 cc

2 g of metal carbonate is neutralised completely by 100 mL of 0.1 N HCI. The equivalent weight of metal carbonate is:

• 50

• 100

• 150

• 200

An excess of AgNO₃ is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitate would be

• 0.001

• 0.002

• 0.003

• 0.01

355.

6.02 x 10²⁰ molecules of urea are present in 100 mL of its solution. The concentration of solution is

• 0.02 M

• 0.01 M

• 0.001 M

• 0.1 M

The normality of 30 volume H₂O₂ is:

• 2.678 N

• 5.336 N

• 8.034 N

• 6.685 N

An organic compound made of C, H and N contains 20% nitrogen. Its molecular weight is

• 70

• 140

• 100

• 65

In the reaction of sodium thiosulphate with I₂ in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

• molar mass of sodium thiosulphate

• the average of molar masses of Na₂S₂O₃ and I₂

• half the molar mass of sodium thiosulphate

• molar mass of sodium thiosulphate × 2

The molarity of a NaOH solution by dissolving 4 g of it in 250 mL water is

• 0.4 M

• 0.8 M

• 0.2 M

• 0.1 M

If it is assumed that ${}_{92}{}^{235}\mathrm{U}$ decays only by emitting $\mathrm{\alpha }$-and ($\mathrm{\beta }$-particles, the possible product of the decay is

• ${}_{89}{}^{225}\mathrm{Ac}$

• ${}_{89}^{227}\mathrm{Ac}$

• ${}_{89}{}^{230}\mathrm{Ac}$

• ${}_{89}{}^{231}\mathrm{Ac}$