Chemistry MCQs for NEET — Practice Questions with Answers

The NCERT states: 'Note that the last two compounds in Table 5.1 have identical empirical formula, $CoCl_3\cdot 4NH_3$, but distinct properties. Such compounds are termed as isomers.' Werner's theory provided a framework to understand such isomeric forms.

The NCERT states, 'In a series of compounds of cobalt(III) chloride with ammonia, it was found that some of the chloride ions could be precipitated as AgCl on adding excess silver nitrate solution in cold but some remained in solution.' This observation was key to differentiating ionisable (primary) and non-ionisable (secondary) valences.

The context states: 'Thionyl chloride is preferred because in this reaction alkyl halide is formed along with gases SO2 and HCl. The two gaseous products are escapable, hence, the reaction gives pure alkyl halides.'

The context mentions: 'The reactions of primary and secondary alcohols with HCl require the presence of a catalyst, ZnCl2.'

The context states: 'With tertiary alcohols, the reaction is conducted by simply shaking the alcohol with concentrated HCl at room temperature.'

The context states: 'Alkyl iodides are often prepared by the reaction of alkyl chlorides/bromides with NaI in dry acetone. This reaction is known as Finkelstein reaction.'

The context explains: 'NaCl or NaBr thus formed is precipitated in dry acetone. It facilitates the forward reaction according to Le Chatelier’s Principle.'

The context lists: 'AgF, Hg2F2, CoF2 or SbF3' as metallic fluorides used in Swarts reaction. NaF is not mentioned.

The context specifies: 'Aryl chlorides and bromides can be easily prepared by electrophilic substitution of arenes with chlorine and bromine respectively in the presence of Lewis acid catalysts like iron or iron(III) chloride.'

The context states: 'Fluoro compounds are not prepared by this method due to high reactivity of fluorine.'