Answer the question on the basis of passage given below:
Aldehydes are generally more reactive than ketones in nucleophilic addition reactions due to steric and electronic reasons. Sterically, the presence of two relatively large substituents in ketones hinders the approach of nucleophile to carbonyl carbon more than aldehydes having only one such substituent Electronically aldehydes are more reactive than ketones because two alkyl groups reduce the elctrophilicity of the carbonyl more effectively than in former.
4-Hydroxy-4-methylpentan-2-one and 4-methylpent-3-en-2-one are the products obtained from A by aldol
condensation. \(A\) is:

The following reaction is an example of:

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Optically active polyhydroxy aldehydes or ketones or molecules which provide such units on hydrolysis are called carbohydrates. They can be broadly classified as monosaccharides, disaccharides and polysaccharides depending on their behavior towards hydrolysis. They are also classified as reducing or non-reducing sugars. Another class of biomolecules is proteins which are polymers of twenty different amino acids linked by peptide bonds. Amino acids can be classified as acidic, basic or neutral depending on the relative number of amino and carboxyl groups in their molecule. The essential amino acids cannot be synthesized by our body and hence must be provided through diet. Nucleic acids are the polymers of nucleotides which in turn consist of a base, pentose sugar and phosphate. There are two types of nucleic acids namely, DNA and RNA which differ in the composition of sugar and a base
The sugar moiety in DNA and RNA molecules, respectively, ar

Answer the question on basis of passage given below :
Lyophobic sols like those of metals (Au, Ag, etc) are unstable and are easily precipitated by addition of electrolytes. However, it is observed that the addition of certain lyophilic colloids like gums, soaps, gelatine, etc. to lyophobic colloids (like a metal sol) render lyophobic colloids difficult to coagulate by the addition of electrolytes. The process is known as 'protection' and the lyophilic colloids are termed as Protective colloids. It is believed that the protective action of the lyophilic colloids is due to the covering up of the particles of the lyophobic colloid by those of the lyophilic colloid.
Evidently, smaller the gold number of a protective colloid, the greater is its protective action.
Which of the following does not form a lyophilic colloid?

Which of the following statements is correct for an enzyme?
(A) It is a biocatalyst.
(B) It can catalyze any chemical reaction.
(C) Almost all enzymes are globular proteins.
(D) They reduce the magnitude of activation energy.
Choose the correct answer from the options given below:

Nitriles on reduction with lithium aluminum hydride produce

The correct order of decreasing \(pK _{ a }\) values of the following compounds

Endosperm is completely consumed during embryo development in the seed of -

Out of students in a school, it is known that \(65 \%\) reside in hostel and \(35 \%\) are day scholars. Previous year results report that \(40 \%\) of the students who reside in hostel attain A grade and 20% of day scholars attain A grade in their annual examination.At the end of the year, one student is chosen at random from the class.
If the selected student attains grade A, find the probability that the student is a hosteller.

The basicity of \(\text{H}_3\text{PO}_4\) is :

Let \(f(x)=\log _e(\sin x), x \in(0, \pi)\), then which of the following statements is/are TRUE?
(A) \(f(x)\) is increasing on \((0, \pi / 2)\)
(B) \(f ( x )\) is decreasing on \(( \pi / 2 , \pi)\)
(C) \(f(x)\) is increasing on \((0, \pi)\)
(D) \(f(x)\) is decreasing on \((0, \pi)\)
Choose the correct answer from the options given below :

A convex lens of focal length 40 cm is placed in contact with a concave lens of focal length 20 cm. If an object is placed at 40 cm in front of the combination, the position of the image formed by the combination is

Minimum value of the function \(f(x) = \sin(3x) + 5\) is equal to :