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Biomolecules — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryBiomolecules1 Mark
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Answer

4-chlorobenzenesulphonic acid

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Write the structure of the following compound.

2-Hydroxycyclopentane carbaldehyde.

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Name the reagent used in the following reaction:

Benzyl alcohol to benzoic acid.

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Write the IUPAC name of the following compound:
$\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{CH}_3\\\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }|\\\text{CH}_2=\text{CH}-\text{C}-\text{OH}\\\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }|\\\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{CH}_3$
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$\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{O}-\text{CH}_3+\text{HBr}\xrightarrow{\ \ \ }$

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What is called lanthanoid contraction?
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Arrange the following in the increasing order of their bond angles- $CH _3 OH , CH _3 OCH _3$ and $C _6 H _5 OH$.
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Read the given passage and answer the questions number 1 to 5 that follow:
The substitution reaction of alkyl halide mainly occurs by SN1 or SN2 mechanism. Whatever mechanism alkyl halides follow for the substitution reaction to occur, the polarity of the carbon halogen bond is responsible for these substitution reactions. The rate of SN1 reactions are governed by the stability of carbocation whereas for SN2 reactions steric factor is the deciding factor. If the starting material is a chiral compound, we may end up with an inverted product or racemic mixture depending upon the type of mechanism followed by alkyl halide. Cleavage of ethers with HI is also governed by steric factor and stability of carbocation, which indicates that in organic chemistry, these two major factors help us in deciding the kind of product formed.
Predict the stereochemistry of the product formed if an optically active alkyl halide undergoes substitution reaction by SN1 mechanism.
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Give names of the reagent that bring about the following transformation:
p-Fluorotoluene to p-fluorobenzaldehyde.
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$\text{C}_6\text{H}_5\text{N}_2\text{Cl}\xrightarrow[(\text{ii})\text{NaNO}_2/\text{Cu}.\Delta]{(\text{i})\text{HBF}_4}$

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Complete each synthesis by giving missing starting material, reagent or product.

$\text{CH}_3\text{COCH}_2\text{COOC}_2\text{H}_5\xrightarrow[(\text{ii})\text{ H}^+]{(\text{i})\text{ NaBH}_4}$

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