Aniline reacts as shown below:
\(C_6 H_5 NH_2 \xrightarrow[0-5^{\circ} C]{NaNO_2+HCl} A \xrightarrow[KCN]{CuCN} B\)
The compound \(B\) is:

Which of the following vitamins are water soluble ?
(A) Thiamine
(B) Riboflavin
(C) Pyridoxine
(D) Ascorbic acid
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It is difficult to separate the ores of Zr and Hf because:

Which of the following cannot be explained by the open chain structure of glucose?

Read the passage carefully and answer the questions
The carbonyl group of aldehydes and ketones is highly polar. The positively charged carbon is readily attacked by electron-rich nucleophile and the negatively charged oxygen atom is attacked by an electro-deficient electrophile. Aldehydes and ketones undergo nucleophilic addition reactions in the presence of acid or a base. The mechanism involves attack of a nucleophile on the electron deficient carbonyl carbon to form a tetrahedral intermediate. A new bond is formed between the carbon and oxygen. Protonation of the anion furnished by the reaction medium yields a neutral addition product. The addition product is same whether the reaction is catalyzed by acid or a base. For example in the presence of base aldehydes and ketones react with hydrogen cyanide to form cyanohydrin.
The source of nucleophile in the base catalyzed cyanohydrin formation is:

Alcohol is more soluble in water when compared to alkanes due to formation of:

Match List-I with List-II

List-I (Complex ion)	List-II (Hybridisation)
(A) \(\left[ CoF _6\right]^{3-}\)	(I) \(d^2 s p^3\)
(B) \(\left[ Co ( CN )_4\right]^{2-}\)	(II) \(s p^3 d^2\)
(C) \(\left[ FeCl _4\right]^{-}\)	(III) \(s p^3\)
(D)\(\left[ Co \left( C _2 O _4\right)_3\right]^{3-}\)	(IV) \(d s p^2\)

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If \(A=\left[\begin{array}{ll}3 & -5 \\ 4 & -7\end{array}\right]\), then \(A^{-1}\) is:

The optical length of an astronomical telescope with magnifying power of 10 for normal adjustment is 55 cm. What is the focal length of the objective ?

GM crops are better to grow because they :
(A) are more tolerant to abiotic stresses
(B) decrease efficiency of mineral usage
(C) are less reliant on chemical pesticides
(D) reduce post harvest losses"
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Derivative of \(x^x\) with respect to \(x\) \(log\) \(x\) is

What is the product of nitration of Benzoic acid?

If \(z\)-coordinate of a point P on the line joining the points A (2, 2, 1) and B (5, 1, -2) is -1, than \(x\)-coordinate of point P is