Low level of Thyroxine hormone is correlated with:

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Amines are considered to be derivatives of ammonia obtained by replacement of hydrogen atoms with alkyl or aryl groups. They are usually prepared from nitro compounds, halides, amides, imides etc. The presence of hydrogen bonding influences its physical properties. In alkylamines, a combination of electron releasing steric and hydrogen bonding factors influences the stability of substituted ammonium cations in protic polar solvents and thus affects the basic nature of amines. Alkyl amines are found to be stronger bases than ammonia which is more basic than water. Primary and secondary amines are engaged in intermolecular association due to hydrogen bonding. This intermolecular association is more in primary amines than in secondary amines. Tertiary amines do not have intermoleulcar association due to the absenceof hydrogen atom available for hydrogen bonding. Thus, the boiling point of amines depends on hydrogen bonding. In aromatic amines, electron releasing and withdrawing groups increase and decrease their basic character. Aryl diazonium salts usually obtained from arylamine undergo replacement of the diazonium group with a variety of nucleophile. Their coupling reaction of aryl diazonium salts with phenol or arylamine results in formation of dyes.
Carbylamine reaction is used as a test for

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The crystal field theory (CFT) is an electrostatic model which considers the metal-ligand bond to be ionic arising purely from electrostatic interactions between the metal ion and the ligand. Ligands are treated as point charges in case of anions or dipoles in case of neutral molecules. The five d orbitals in an isolated gaseous metal atom/ion have same energy, i.e., they are degenerate. This degeneracy is maintained if a spherically symmetrical field of negative charges surrounds the metal atom/ion. However, when this negative field is due to ligands (either anions or the negative ends of dipolar molecules like NH3 and H2O) in a complex, it becomes asymmetrical and the degeneracy of the d orbitals is lifted. It results in splitting of the d orbitals. The pattern of splitting depends upon the nature of the crystal field.
In tetrahedral coordination complexes, low-spin configurations are rare because:

Arrange the following compounds in increasing order of their acidity :
(A) Phenol
(B) 4 -methylphenol
(C) 3-nitrophenol
(D) 4-nitrophenol
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As aldehydes ketones possess the carbonyl functional group, they show similar reactions. They exhibit nucleophilic addition reactions, reduction, oxidations, reactions due to alpha-Hydrogen atom, and many other reactions, like Cannizzaro reaction to electrophilic substitution reactions (in case of aromatic aldehydes ketones).
These reactions help in the preparation of a number of important compounds, like acetic acid, vinyl acetate, polymers and in perfume and dye industries. Nucleophilic addition reactions form cyanohydrins, acetals, alcohols and N -substituted derivatives like imine, oxime, semicarbazone, phenylhydrazone Schiff's base. Reactions due to alpha-hydrogen atoms help in formation of aldols and alpha, beta-unsaturated aldehydes ketones.
Which of the following does not give iodoform test?


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Addison's disease is not characterised by

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A ketone \([ A ]\) which undergoes haloform reaction gives compound \([ B ]\) on reduction. Compound
\([B]\) on heating with sulphuric acid gives compound \([C]\) which forms monozonide \([D]\). The compound \([ D ]\) on hydrolysis in the presence of zinc dust gives compound \([ E ]\). 
Compound \([ E ]\) on oxidation gives \(C _2 H _4 O _2\) [F]
Compound [E] in presence of dil NaOH gives :

Trichoderma species is:
(A) Free living fungi
(B) Very common in the root ecosystem
(C) Effective biocontrol agent
(D) Resistance to insects
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Answer the questions from the figure given below:

'Taq' in Taq polymerase stands for:

Arrange the given associated wavelengths (\(\lambda_1, \lambda_2, \lambda_3 \text{ and } \lambda_4\)) of radiations with the part of the electromagnetic spectrum in decreasing order of magnitude:
(A) \(\lambda_1\) used to detect fracture in bones
(B) \(\lambda_2\) used to kill germs in water purifiers
(C) \(\lambda_3\) used to treat muscular strain
(D) \(\lambda_4\) used to transmit voice communication
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A wire of resistance \( 5 \, \Omega \) is drawn out so that its length is increased to thrice its original length. The new resistance would be :

Let \(\vec{a}, \vec{b}\) and \(\vec{c}\) be three vectors such that \(|\vec{a}|=2,|\vec{b}|=3,|\vec{c}|=5\) and each one of three vectors is perpendicular to the sum of the other two, then value of \(|\vec{a}+\vec{b}+\vec{c}|\) is

If \(A\) is a square matrix of order 3 such that \(|A|=2\), then \(\operatorname{adj}(\operatorname{adj} A)\) is :