Arrange the following alcohols, hydrocarbon and ether in order of their increasing boiling points Pentan – 1 – ol, n – butane, pentanal, ethoxyethane.

The reagents to bring about the change from but – 2 – ene to ethanal

A strong base can abstract an α – hydrogen from

The appropriate reagent for the transformation:

Statement Type

Direction (Q. Nos. 16-19) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Statement I : In aldol condensation, enoiates are nucleophilic and reversibly attack the carbonyl carbon of aldehyde or ketone in the aldoi condensation.

Statement II : An aldoi on refluxing with dilute base gives back the carbonyl compound.

Statement I: When a mixture of ethanal and propanal is treated with aqueous Na₂CO₃, four aldol (excluding stereoisomers) are formed.

Statement II: In mixed aldol condensation, two self and two cross condensation products are always formed.

Statement II : In the given compound, γ-H is most acidic, forms the required enolate.

Consider the reaction below,

The correct statement(s) regarding the above process is/are

In general, ketones are less reactive than aldehydes in nucleophilic addition reaction, for both steric and electronic reasons. Hence, if a keto-aldehyde is treated with nucleophilic reagent, reaction occur first at aldehyde group.

Consider the following reaction,

Major product is

In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.

Reason (R): Acyl group sterically hinders the approach of further acyl groups.

In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Aromatic 1° amines can be prepared by Gabriel Phthalimide synthesis.

Reason (R): Aryl halides do not undergo nucleophilic substitution with anion formed by phthalimide.

Nitro compounds are reduced to amines. The catalyst that is preferred is:

Aniline can be prepared by:

What is the end product in the following sequence of reactions?

Gabriel phthalimide synthesis is used in the preparation of :

To convert methyl cyanide to ethylamine we use:

Glycogen is a branched chain polymer of α-D-glucose units in which chain is formed by C1—C4 glycosidic linkage whereas branching occurs by the formation of C1-C6 glycosidic linkage. Structure of glycogen is similar to ______.

Which of the following polymer is stored in the liver of animals?

Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives _________.

Proteins are found to have two different types of secondary structures viz. α-helix and β-pleated sheet structure. α-helix structure of protein is stabilised by :

Which of the following is NOT a culinary use of oil in the food industry?

DNA and RNA contain four bases each. Which of the following bases is not present in RNA?

Which of the compounds is the main flavouring agent in vanilla?

Which of the following will not react with HCN?

Which of the following aldehydes contains α - C atom but does not have any α - H atom?

In the following question, two statements are given. One is Assertion, and the other is Reason. Examine the statements carefully and mark the correct answer according to the instructions given below.

Assertion: 2, 2-dimethyl propanal gives the Cannizaro reaction with concentrated NaOH.
Reason: Cannizaro reaction is a disproportionation reaction.

The correct order of decreasing acid strengths of trichloroacetic acid (A), trifluoroacetic acid (B), benzoic acid (C), and formic acid (D) is

In the following question, two statements are given. One is Assertion, and the other is Reason. Examine the statements carefully and mark the correct answer according to the instructions given below.

Assertion: The oxidation of ketone by perbenzoic acid gives esters.

Reason: Perbenzoic acid oxidises because of the release of nascent oxygen on dissociation.

Primary amine reacts with carbon disulphide and HgCI₂ to produce alkyl isothiocyanate. This reaction is:

When aniline is sulphonated, which of the following is obtained?

Nitrobenzene gives N-phenylhydroxylamine by

Which of the following has the strongest base?

Consider the following alkyl halides:

During Hoffmann ammonlysis reaction, which of the following cannot be used for the formation of amines?

The Hoffmann Bromamide degradation reaction is

The rate of this reaction depends upon the nature of substituent 'X'. Which of the following is the correct decreasing order of rate of degradation with various substituents?

Which among the following statements is incorrect?

Which of the following B group vitamins can be stored in our body?

Which one of the following bases is not present in DNA?

Three cyclic structures of monosaccharides are given below which of these are anomers.

Which of the following reactions of glucose can be explained only by its cyclic structure?

In the following question, two statements are given. One is assertion and the other is reason. Examine the statements carefully and mark the correct answer according to the instructions given below.

Assertion: Deoxyribose (C5H10O4) is not a carbohydrate.

Reason: Carbohydrates are hydrates of carbon. So, the compounds which follow Cx(H2O)y formula are carbohydrates.

In the following question, two statements are given. One is assertion and the other is reason. Examine the statements carefully and mark the correct answer according to the instructions given below.

Assertion: Disruption of the natural structure of a protein is called denaturation.

Reason: The change in colour and appearance of egg during cooking is due to denaturation.

The β glucose and α glucose have different specific rotations. When either is dissolved in water, their rotation changes until the same fixed value results. This is called

The hormone that controls the processes like burning of fats, proteins and carbohydrates to liberate energy in the body, is

Secondary structure of proteins refers to

What is the maximum number of monosaccharides that can be obtained by hydrolysis of one molecule of oligosaccharide?

Which is the cofactor for the proteolytic enzyme carboxypeptidase?

Who among the following was/were the first to observe, describe and sketch a free living cell?

Two equatorial plates are formed by the centromeres in

Which of the following vacuoles occur in the cells of protozoan protists, several lower animals and phagocytes of higher animals?

The plasma membrane consists mainly of

Proteins are linear chains of amino acids. Which of the following proteins enables glucose transport into the cells?

Centrosome and centrioles are made up of nine evenly spaced peripheral fibrils of

Golgi complex and endoplasmic reticulum cannot be seen during

Match the columns:

Match the following and select the correct answer.

Catalysts and enzymes remain unchanged chemically and quantitatively at the end of the reaction. Which of the following is also a similarity of catalysts and enzymes?

The cytoplasmic connections from cell to cell are known as

Which phase of mitosis shows the formation of asters before the splitting of centromere?

Astral rays start developing when centrioles move towards the opposite poles. Thus aster formation occurs here.

Cell respiration is carried out by

Which of the following is the stage of inactivation of cell cycle due to non-availability of mitogens and energy rich compounds?

Reticulate venation is a characteristic in

Enzymes are mainly functional inside the living cells. Which of the following factors influence(s) enzyme activity?

Based on the comparitive number of amino and carboxyl groups, amino acids can be acidic, basic or neutral. The amino acids having one amino group and one carboxylic group with noncyclic hydrocarbon chain are

Which of the following statements about animal mitosis is false?

Which of the following is/are not the example(s) of metabolic transformations?

a. Removal of CO2 from amino acids converting an amino acid into an amide

b. Removal of amino group in a nucleotide base

c. Hydrolysis of a glycosidic bond in a disaccharide

Depending upon their colour, plastids are of three main types. Which of the following are colourless plastids that generally occur near the nucleus of non-green cells and possess internal lamellae?

a. Leucoplasts

b. Chromoplasts

c. Chloroplasts

Meiosis II is divided into four phases. The centromere of each chromosome divides into two so that there is one centromere for each chromatid in

In diploid cells,each homologous chromosome consists of

NADP contains the vitamin:

Mitosis is the most common method of division which brings about growth in multicellular organisms. Which of the following is/are the significance of mitosis?

Consider the following statements and answer accordingly:

a. The protistan Paramecium caudatum has two nuclei, macronucleus for controlling metabolic activities of organism and micronucleus possessing hereditary information.

b. Nucleus is suspended in central vacuole by cytoplasmic strands in Spirogyra.

Which one of the following precedes re-formation of the nuclear envelope during M phase of the cell cycle?

In eukaryotic cells, 70S ribosomes are found in

a. cytoplasm

b. chloroplast

c. mitochondria

d. endoplasmic reticulum

Choose the correct option.

Which of the following does not occur in prophase?

A: Chromosomal material condenses to form compact mitotic chromosomes.

B: Centromeres split and chromatids separate.

C: Centrosome, which had undergone duplication during interphase, begins to move towards opposite poles of the cell.

Proteins are polymerisation product of

In animal cells, the mitotic division is seen in

Select the incorrect matching

The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed as

G₂ Phase prepares the cell to undergo division. Which of the following is the characteristic of G₂ Phase?

Lampbrush chromosome where two homologous chromosome with several chiasmata with several loops in chromatic region is found in

In shape, bacterial cells are of many types. The shape of which of the following bacteria is coiled like a cork-screw?

Lysosomes are produced by

An example of competitive inhibition of an enzyme is the inhibition of

Arrange the following events of meiosis in the correct sequence.

I. Terminalisation

II. Crossing over

III. Synapsis

IV. Disjunction of genomes

No cell could live without

Which of the following pairs is incorrect?

Transmembrane proteins of cell membrane are

Which of the following statements is/are incorrect about anaphase?

1. Centromeres split and chromatids separate.

2. Chromatids move to opposite poles.

3. Nucleolus, Golgi complex and ER reform.

Enzymes are commonly proteinaceous substances that are synthesised by living cells. Which of the following groups of enzymes catalyse bonding of two chemicals with the help of energy obtained from ATP resulting in formation of bonds like C-O, C-S, C-N and P-O?

What are the short repeatedly branched fibres called?

Which of the following gas is found to work as a second messenger?

Match the following:

Column A

a) PTH

b) Cortisol

c) Aldosterone

d) Somatostatin

Column B

i) Mineralocorticoid

ii) Inhibiting hormone

iii) Collip’s hormone

iv) Glucocorticoid

Thyroid gland do not secrete

In the following identify from up to down:

Which of the following cells secrete a myelin sheath?

Read the following statements:

i. endocrine system corrects the imbalance originally detected by the nervous system.

ii. nerve cells and endocrine cells exist side by side in adrenal gland and pituitary.

Glucose will be lost in the urine of patients suffering from:

Which of the following functions is not performed by neurons?

The Prolactin inhibiting neurohormone is :

Brain stem is the support system of brain and is the collective name for:

An abnormality in the functioning of which of these hormones can lead to diabetes insipidus?

Where are the myelinated neurons found?

Pituitary dwarfs will not show :

Read the following about neurohypophysis:

i. Neurohypophysis secretes neurohormones.

ii. Oxytocin and ADH are synthesized in neurohypophysis

Old people usually exhibit weaker immune power due to degeneration of

Which of the following statements is incorrect regarding electrical synapses?

Match the following:

The dura mater of meninges is

Which part of the central nervous system acts as the master clock?

Glucocorticoid release from the adrenal cortex is stimulated by

After receptor binds to hormone, cAMP for water-soluble hormones acts as the

Which of the following helps in maintaining the shape of the front part of the eye and provides nutrients to the cornea?

Increase in blood sugar level with simultaneous breaking down of proteins is caused by

Gigantism and acromegaly are due to

Which of the following is an air-filled, membrane-lined space located between the ear canal and the Eustachian tube, cochlea and auditory nerve?

The function of which of the following is to receive and integrate signals from spinal cord and further send the resulting signals to the cerebellum and thalamus?

What happens if the thymus is damaged during childhood?

The vital centres of medulla oblongata consist of all the following centres, except

Which of the following statements is incorrect?

In human eye, where is the image with greatest resolution formed?

A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient, and abnormal skin. This is the result of

Hormone glucagon gets activated in which of the following conditions?

The neural system in humans is divided into two parts. Which of the following is/are included in the central neural system?

a. All the nerves of the body

b. The brain

c. The spinal cord

Which artery is the only one that carries deoxygenated blood?

The correct matched pair out of the following is :

The hormone causing release of milk after the birth of young one is:

Read the following statements about gestational diabetes:

i. It must be controlled to protect baby’s growth and development.

ii. It puts women at risk for developing Type – 1 diabetes.

What does each branch of axon terminate into?

Where are the specific receptors of neurotransmitters present?

Identify the labelled parts in the given diagram.

Which of the following is the moderately tough inner meninx of the brain and is highly vascularised and pigmented?

Sella turcica is a small bony cavity that surrounds

Parafollicular cells of thyroid secrete a hormone that functions in

Which of the following statements is correct?