Chemistry

_____ grams of 3-Hydroxy propanal (MW = 74) must be dehydrated to produce 7.8g of acrolein (MW = 56) (C?H?O) if the percentage yield is 64. (Round off to the nearest integer).
[Given: Atomic masses: C: 12.0u, H:1.0u, O:16.0u]

For the reaction
2Fe³?(aq) + 2I?(aq) → 2Fe²?(aq) + I?(s)
The magnitude of the standard molar free energy change, ?rG° = ____ kJ (Round off to the nearest integer).
[Given: E°(Fe²?/Fe(s)) = -0.440V; E°(Fe³?/Fe(s)) = -0.036V; E°(I?/2I?) = 0.539V; F = 96500C]

AX is a covalent diatomic molecule where A and X are second row elements of periodic table. Based on molecular orbital theory, the bond order of AX is 2.5. The total number of electrons in AX is _____. (Round off to the nearest integer).

In order to prepare a buffer solution of pH 5.74, sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is 1.0 M, the concentration of sodium acetate in the buffer is _____ M. (Round off to the nearest integer).
[Given: pKa (acetic acid) = 4.74]

For the reaction C?H? → C?H? + H? the reaction enthalpy ?rH = ____ kJ mol?¹. (Round off to the nearest integer).
[ Given: Bond enthalpies in kJ mol?¹ : C-C: 347, C=C:611; C-H:414,H-H:436]

A reaction of 0.1 mole of Benzylamine with bromomethane gave 23g of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are n x 10?¹, when n=_____. (Round off to the nearest integer).
[Given: Atomic masses: C=12.0u, H:1.0u, N:14.0u, Br:80.0u]

The statements that are TRUE:
(A) Methane leads to both global warming and photochemical smog.
(B) Methane is generated from paddy fields.
(C) Methane is a stronger global warming gas than CO?.
(D) Methane is a part of reducing smog.
Choose the most appropriate answer from the options given below:

The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is:

Reaction of Grignard reagent, C?H?MgBr with C?H?O followed by hydrolysis gives compound "A” which reacts instantly with Lucas reagent to give compound B, C?H?Cl. The compound B is: