Aldehyde ketones & carboxylic Acid MCQs for NEET — Chemistry Questions with Answers

To solve this, we need to use the concept of equivalent weights and normality. The equivalent weight of oxalic acid ($C_2H_2O_4 imes 2H_2O$) is calculated as follows: Molecular weight of oxalic acid dihydrate = 126 g/mol. Since oxalic acid is diprotic (gives 2 H+ ions), its equivalent weight is 126/2 = 63 g/equiv. Therefore, the weight of oxalic acid crystals in 1N solution will be 63g.

When butane nitrile (butanenitrile) reacts with ethylmagnesium bromide (Grignard reagent), it forms an imine intermediate which on hydrolysis yields a ketone. Specifically, the product is Hexan-3-one.

Statement 1 is true because carboxylic acids are obtained by the hydrolysis of cyanide compounds, and ammonia is liberated in the process. Statement 2 is also true because primary amines are obtained by the reduction of cyanide compounds in the presence of $LiAlH_4$. However, Statement 2 is not a correct explanation for Statement 1, as they describe two different reactions involving cyanide compounds.

The compound $CH_2=CH-CN$ can be named in different ways:

1. Acrylonitrile, which is the common name.
2. Vinyl cyanide, which indicates the presence of a vinyl group ($CH_2=CH-$) and a cyanide group ($-CN$).
3. Prop-2-enenitrile, which follows the IUPAC nomenclature rules, indicating a three-carbon chain with a double bond starting from the second carbon and a nitrile group ($-CN$). Therefore, all the given names are correct.

Butan-2-ol, when heated with concentrated $H_2SO_4$, undergoes dehydration to form but-2-ene, which exhibits geometrical isomerism (cis and trans forms). The other alcohols either do not produce alkenes or do not produce alkenes that exhibit geometrical isomerism.

When ethyl alcohol (ethanol) is treated with chlorine, a series of substitution reactions can occur. Under controlled conditions, the final product is chloral (trichloroacetaldehyde), which has the formula $CCl_3CHO$. The reaction proceeds through intermediate stages where ethyl alcohol is progressively chlorinated.