JEE Mains Question Paper 2018 Chemistry Part 9 Download all the papers for 2019 Exam

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Q-24: Phenol on treatment with in the presence of followed by acidification produces compound as the major product. On treatment with in the presence of catalytic amount of produces:

Options:

(A)

Image of cphenol on treatment

Image of Cphenol on Treatment

Image of cphenol on treatment

(B)

Image of cphenol on treatment

Image of Cphenol on Treatment

Image of cphenol on treatment

(C)

Image of cphenol on treatment

Image of Cphenol on Treatment

Image of cphenol on treatment

(D)

Image of cphenol on treatment

Image of Cphenol on Treatment

Image of cphenol on treatment

Answer: (A)

Solution:

Image of cphenol on treatment

Image of Cphenol on Treatment

Image of cphenol on treatment

Mechanism:

Image of phenol actylationand tutomerism

Image of Phenol Actylationand Tutomerism

Image of phenol actylationand tutomerism

Q-25: An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

Options:

(A)

(B)

(C)

(D)

Answer: (C)

Solution:

  • When a weak base is titrated with string acid with methyl orange as an indicator then at end point

  • Methyl orange shows Red(pinkish) color in Acidic medium & yellow color in basic medium since original solution is basic so initial color yellow & Titrated with acid so Final color pinkish (red).

Image of methyl orange show

Image of Methyl Orange Show

Image of methyl orange show

The colour change will be yellow to pinkish red.

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