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This is a short answer type question as classified in NCERT Exemplar

The decreasing order of reactivity of alcohol with sodium metal:

Tertiary Alcohols > Secondary Alcohols   > Primary Alcohols 

When alcohol reacts with active metals  e.g. Na. K etc., the O-H bond of alcohols breaks to form the corresponding alkoxide. The alkyl  group is electron donating and has +I effect due to which the O-H bond becomes strong and hence, the reactivity of alcohol decreases.

Fig: +I effect of alkyl group of alcohol

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This is a short answer type question as classified in NCERT Exemplar

The increasing order of acidity:

o-cresol  <  Phenol   <  o-nitrophenol

The electron-withdrawing group on the substituted phenol increases the acidity due to increasing the polarity of the O-H bond and thus, the acidity increases  and vice versa. -NO₂ is an electron-withdrawing group whereas the -CH₃ group is an electron-donating group.

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This is a short answer type question as classified in NCERT Exemplar

Out of o-nitrophenol and o-cresol, o-nitrophenol  is more acidic due to the -I effect and -R effect of -NO₂ group as the -NO₂ group is an electron withdrawing group whereas the -CH₃ group is electron releasing group and has +I effect on the conjugate base which increases the electron density and decreases the polarity of O-H bond and hence less acidic.

Fig: The -I effect of NO₂ group and + I effect of CH₃ group on the polarity of O-H bond

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This is a short answer type question as classified in NCERT Exemplar

Out of o-nitrophenol and p-nitrophenol, o-nitrophenol is more volatile due to presence of intramolecular hydrogen bonding in o-nitrophenol whereas p-nitrophenol has intermolecular hydrogen bonding.

The MBOSE SSLC sample papers are released on the official website- mbose.in only. Students can click on MBOSE 10th sample question papers to download them. To get them offline, they can take a printout of the question papers and start solving them for better preparation of the exams. 

Solving the MBOSE SSLC sample question papers will help students know their weak areas and work on them. 

This is a short answer type question as classified in NCERT Exemplar

The strong oxidising agents such as acidified KMnO₄ or  K₂Cr₂O₇ reagents are used for the conversion of ethanol to ethanoic acid. These reagents are so strong that they convert the alcohols to carboxylic acids.

Yes, questions are of the same pattern as given in the sample papers. Students must also solve and practice the practice questions and previous years question papers as released by the board.

This is a short answer type question as classified in NCERT Exemplar

The reagent used for the conversion of ethanol to ethanal is pyridinium chlorochromate (PCC) which is a complex formed by CrO₃, pyridine and HCl which converts the primary alcohols to aldehydes.

CH₃—CH₂—OH CH₃—CHO

Ethanol                                   Ethanal

This is a short answer type question as classified in NCERT Exemplar

2-chloroethanol is more acidic than ethanol  because the conjugate base  of  2-chloroethanol   is more stable than that of ethanol due to the -I effect of chlorine atom.

Stability:   Cl—CH₂—CH₂—OΘ           >                     CH₃—CH₂—OΘ

Acidity:     Cl—CH₂—CH₂—OH   >                     CH₃—CH₂—OH