Class 12th

The drug tegamet is:

When sugar 'X' is boiled with dilute H₂SO₄ in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with HNO₃ yields saccharic acid where as 'B' is laevorotatory. The compound 'X' is:

Given below are two statements, one is Assertion (A) and other Reason (R).

Assertion (A): Natural rubber is a linear polymer of isoprene called cis-polyisoprene with elastic properties.

Reason (R): The cis-polyisoprene molecules consist of various chains held together by strong polar interactions with coiled structure.

In the light of the above statements, choose the correct one from the options given below:

With respect to the following reaction, consider the given statements:

(A) o-Nitroaniline and p-nitoraniline are the predominant products.

(B) p-Nitroaniline and m-nitroaniline are the predominant products.

(C) HNO₃ acts as an acid.

(D) H₂SO₄ acts as an acid.

Choose the correct option.

Isobutyraldehyde on reaction with formaldehyde and K₂CO₃ given compound   'A'. Compound 'A' reacts with KCN and yields compound 'B', which on hydrolysis gives a stable compound 'C'. The compound 'C' is

 

A $\underset{\begin{array}{l}\left(ii\right)C{N}^{-}\\ (ii)H_{2}O/H^{+}\end{array}}{\overset{\begin{array}{l}\left(i\right)C{l}_2,\Delta \\ \end{array}}{\to }}$ 4-Bromophenyl acetic acid.

In the above reaction 'A' is

The major product of the given reaction is (where, Me is – CH₃)

Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20Ω . A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is :       

The correct IUPAC name of the following compound is: