The most suitable substrates for preparation of following alcohol is

Neutral or weakly alkaline \(KMnO_4\) solution will oxidise iodide ion into :

What is the product of the following reaction?
\(R - CH _2- COOH \xrightarrow[(i i) H _2 O ]{( i ) X _2 / \text { Red phosphorus }( X = Cl , Br )}\) ?

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Nearly all the transition elements display typical metallic properties such as high tensile strength, ductility, malleability, high thermal and electrical conductivity and metallic lustre. The transition metals (with the exception of Zn, Cd and Hg) are very hard and have low volatility. Their melting and boiling points are high. They have high enthalpies of atomization. lons of the same charge in a given series show progressive decrease in radius with increasing atomic number. However, the variation within a series is quite small. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction which essentially compensates for the expected increase in atomic size with increasing atomic number. The net result of the lanthanoid contraction is that the second and the third d series exhibit similar radii (e.g., Zr 160 pm, Hf 159 pm) and have very similar physical and chemical properties. There is an increase in ionisation enthalpy along each series of the transition elements from left to right. The first ionisation enthalpy, in general, increases, but the magnitude of the increase in the second and third ionisation enthalpies for the successive elements, is much higher along a series. One of the notable features of a transition elements is the great variety of oxidation states these may show in their compounds.
Atomic number of Fe, Co, Ni and Cu are 26, 27, 28 and 29 respectively. Which among them is expected to possess the highest value for the second ionization enthalpy?

\(^{70}Yb^{2+}\) and \(^{71}Lu^{3+}\) Lanthanoid ions are..........

Match List-I (compound) with List-II (reagent or chemical test)

List-I (Compound)	List-II (Reagent or Chemical test)
(A) Phenols	(I) Tollen's test
(B) Amines	(II) \(NeutralFeCl _3 aq\). solution
(C) Aldehydes	(III) Iodoform Test
(D) Methyl Ketones	(IV) Hinsberg's Test

Choose the correct answer from the options given below:

Which of the following will show positive Fehling's test?
(A) Propanone
(B) Propanal
(C) Benzaldehyde
(D) p-Methoxy benzaldehyde (E) 2-Phenyl ethanal
Choose the correct answer from the options given below :

Arrange the following complexes in increasing order of their magnetic moment
(A)\([CoF_6]^{3-}\)
(B) \([Co(H_2O)_6]^{2+}\)
(C)\([FeF_6]^{3-}\)
(D)\([Fe(CN)_6]^{4-}\)
Choose the correct answer from the options given below:

Which of the following diseases is caused by a virus?

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Does the number of species in a community really matter to the functioning of the ecosystem? This is a question for which ecologists have not been able to give a definitive answer. For many decades, ecologists believed that communities with more species, generally, tend to be more stable than those with less species. According to the International Union for Conservation of Nature and Natural Resources (IUCN) (2004), the total number of plant and animal species described so far is more than 1.5 million.
Among the vertebrates, which of the following is the most species-rich group ?

The technology of biogas production was developed in India mainly due to the efforts of -

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In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of these regulatory mechanisms. Cancerous cells just continue to divide giving rise to masses of cells called tumors. Benign tumors normally remain confined to their original location. The malignant tumors, on the other hand are a mass of proliferating cells. These cells actively divide and starve the normal cells by competing for vital nutrients. Cells sloughed from such tumors reach distant sites through blood, and wherever they get lodged in the body, they start a new tumor there. This property is called metastasis. Transformation of normal cells into cancerous cells may be induced by physical, chemical or biological agents called carcinogens.
Benign tumors are normally remain confined to:

A person creates a sinking fund to accumulate 60,000 in 5 years to buy a bike.
The amount to be deposited at the end of every quarter with a 12\% rate of interest compounded quarterly is :
Use \(\frac{0.03}{(1.03)^{20}-1}=0.0372\)