Chemistry MCQs for NEET — Practice Questions with Answers

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How are the common names of ketones typically derived?

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Explanation

The common names of ketones are derived by naming two alkyl or aryl groups bonded to the carbonyl group. (NCERT, p. 229)

When numbering the carbon chain in an open-chain aliphatic aldehyde for IUPAC nomenclature, where does the numbering begin?

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Explanation

In case of aldehydes, the longest carbon chain is numbered starting from the carbon of the aldehyde group during IUPAC nomenclature. (NCERT, p. 229)

What is the accepted common name for the simplest aromatic aldehyde carrying an aldehyde group on a benzene ring, even by IUPAC?

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Explanation

The name of the simplest aromatic aldehyde carrying the aldehyde group on a benzene ring is benzenecarbaldehyde. However, the common name benzaldehyde is also accepted by IUPAC. (NCERT, p. 229)

What suffix is added when an aldehyde group is attached to a ring in IUPAC nomenclature?

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Explanation

When the aldehyde group is attached to a ring, the suffix carbaldehyde is added after the full name of the cycloalkane. (NCERT, p. 229)

In the common naming system for aldehydes, how is the $\alpha$-carbon defined?

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Explanation

In common names, the $\alpha$-carbon being the one directly linked to the aldehyde group, $\beta$-carbon the next, and so on. (NCERT, p. 228)

What is the IUPAC name for $(CH_3)_2CHCHO$?

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Explanation

As per Table 8.1, the IUPAC name for $(CH_3)_2CHCHO$ (Isobutyraldehyde) is 2-Methylpropanal. (NCERT, p. 230)

Which of the following compounds has the common name Mesityl oxide?

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Explanation

Table 8.1 lists $(CH_3)_2C=CHCOCH_3$ as Mesityl oxide, with the IUPAC name 4-Methylpent-3-en-2-one. (NCERT, p. 230)

What is the IUPAC name for Acrolein?

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Explanation

According to Table 8.1, the IUPAC name for Acrolein ($CH_2=CHCHO$) is Prop-2-enal. (NCERT, p. 230)

For cyclic ketones, where does the numbering of the carbon atoms begin in IUPAC nomenclature?

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Explanation

The same applies to cyclic ketones, where the carbonyl carbon is numbered one. (NCERT, p. 229)

Which of the following is the IUPAC name for $CH_3COCH_2CH_2CH_3$?

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Explanation

As seen in Table 8.1, the common name Methyl n-propyl ketone corresponds to the IUPAC name Pentan-2-one. (NCERT, p. 230)

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