Ncert Solutions Chemistry Class 12th

Which statement regarding polymers is not correct?

RMgX + CO₂ --(dry ether)--> Y --(H₃O⁺)--> RCOOH

What is Y in the above reaction?

The incorrect statement regarding enzymes is:

The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

The incorrect statement regarding chirality is:

Given below are two statements:

Statement I:
In the coagulation of a negative sol, the flocculating power of the three given ions is in the order- Al³⁺ > Ba²⁺ > Na⁺

Statement II:
In the coagulation of a positive sol, the flocculating power of the three given salts is in the order NaCl > Na₂SO₄ > Na₃PO₄

In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements:

Statement I:
Primary aliphatic amines react with HNO₂ to give unstable diazonium salts.

Statement II:
Primary aromatic amines react with HNO₂ to form diazonium salts which are stable even above 300 K.

In the light of the above statements, choose the most appropriate answer from the options given below:

Match List -I with List -II.

List -I
(Products formed)
(a) Cyanohydrin
(b) Acetal
(c) Schiff's base
(d) Oxime

List-II
(Reaction of carbonyl compound with)
(i) NH?OH
(ii) RNH?
(iii) alcohol
(iv) HCN

Choose the correct answer from the options given below:

Match List -I with List -II.

List -I
(Drug class)
(a) Antacids
(b) Antihistamines
(c) Analgesics
(d) Antimicrobials

List-II
(Drug molecule)
(i) Salvarsan
(ii) Morphine
(iii) Cimetidine
(iv) Seldane

Choose the correct answer from the options given below:

Given below are two statements:

Statement I:
The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole-dipole interactions.

Statement II:
The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of H-bonding.

In the light of the above statements, choose the most appropriate answer from the options given below: