Which of the following compounds can be used as antifreeze in automobile radiators?

What is the correct sequence for converting Ethanoic acid to propanoic acid ? (A) \(CH_3CH_2OH\)
(B) \(CH_3CH_2CN\)
(C) \(CH_3CH_2I\)
(D) \(CH_3CH_2COOH\)
(E) \(CH _3 COOH\)
Choose the correct answer from the options given below :

Aqueous \(CuSO _4\) solution gives green precipitate of \(( X )\) with aqueous KF.
Correct formula of X is:

Read the passage carefully and answer the Questions
The term vitamin was coined from the word vital +amine since the earlier identified compounds had amino groups. Later work showed that most of them didn't contain amino groups, so the letter "e" was dropped and ther term vitamin is used these days.
Vitamins are classified into two groups depending upon their solubility in water or fat. Fat soluble vitamins are soluble in fat and oils but insoluble in water. They are stored in liver and adipose (fat storing) tissues. Water-soluble vitamins are soluble in water. They must be supplied regularly in the diet as they are readily excreated in urine.
Among the following, water-soluble vitamin is

The correct order for increasing the boiling point of hydrides (given below) of group 15 is:
(A) \(NH _3\)
(B) \(PH _3\)
(C) \(AsH _3\)
(D) \(SbH _3\)
(E) \(BiH _3\)
Choose the correct answer from the options given below :

Answer the question on basis of passage given below :
Chloroform is a very useful solvent for oils, fats and waxes and many organic compounds. It can also be used for preserving biological specimens. Chloroform was used as a general anaesthetic in surgery for a long time but because of its toxic nature, it is no longer used these days.
Chloroform is useful for us because :

Question based on the following passage: P-Block elements are placed in group 13 to 18 in the periodic table. Group 15 is nitrogen family.
Nitrogen can react with hydrogen, oxygen, halogens etc. It shows multiple oxidation states in its various oxides i.e. \(N_2O, N_2O_3, N_2O_5\) etc. Important allotropic forms of phosphorus are white, red and black phosporus. Various compounds of phosphorus are phosphine, \(PCl_3, PCl_5\) and oxoacids of phosphorus. Oxidation states \(+1\) to \(+5\) are seen in various oxoacids of phosphorus. Group 17 elements are collectively known as halogens. Bond dissociation enthalpy of \(F_2\) is smaller than \(Cl_2\).
The gases present in group 18 are chemically unreactive, they form only few compounds. Neil Bartlett (in 1962) observed the reaction of a noble gas. Since then, many noble gas compounds have been synthesised.
Explosive nature of fluorine (\(F_2\)) is due to:

Ten bulbs are drawn successively with replacement from a lot containing \(10 \%\) defective bulbs. The probability that there is at least one defective bulb is :

Phenol reacts with sodium hydroxide and carbon dioxide in acidic medium to produce:

A fisherman is rowing a boat. He takes 6 hours to row 48 km upstream whereas he takes 3 hours to go to the same distance downstream.
Based on the above information, which of the following are correct?
(A) His speed of rowing in still water is 10 km/hour.
(B) The speed of the stream is 3 km/hour.
(C) The average speed of the fisherman is 32/3 km/hour.
(D) The speed of the stream is 4 km/hour.
Choose the correct answer from the options given below :

If the flux of the electric field through a closed surface is zero.
(A) The electric field must be zero everywhere on the surface.
(B) The electric field may be zero everywhere on the surface.
(C) The charge inside the surface must be zero.
(D) The charge in the vicinity of its surface must be zero.
(E) The charge inside the surface may be zero.
Choose the correct answer from the options given below :

The corner points of feasible region determined by the following systems of linear inequalities :
\(2 x+y \leq 10, x+3 y \leq 15, x \geq 0, y 0\) are \((0,0),(5,0),(3,4)\) and \((0,5)\)
Let \(z=p x+q y\), when \(p, q>0\) then the relation between \(p\) and \(q\), so that maximum of \(z\) occurs at both points \((3,4)\) and \((0,5)\) is:

If \(y=\log x^5\), then \(\frac{d^2 y}{d x^2}\) is given by :