323987
Acetaldehyde is used: (A) as antiseptic inhalent (B) in the preparation of a hypnotic (C) in the preparation of solid fuel (D) in the preparation of unbreakable glass
1 A,B,C only
2 B,C,D only
3 A,C,D only
4 All A,B,C,D
Explanation:
Acetaldehyde is an antiseptic inhalent in nose troubles. Paraldehyde (cyclic trimer of acetaldehyde) is hypnotic. Acetaldehyde can be used as a solid fuel.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323988
Assertion : Formaldehyde contains no alkyl group in its molecule. Reason : Formaldehyde condenses with phenol to give resin.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Formaldehyde is, Formaldehyde undergoes condensation with phenol, catalyzed by dilute \(\mathrm{NaOH}\) or ammonia at elevated temperatures, forming phenolformaldehyde resin (bakelite) through crosslinking, resulting in a strong and resilient threedimensional network structure. So the option (2) is correct.
323987
Acetaldehyde is used: (A) as antiseptic inhalent (B) in the preparation of a hypnotic (C) in the preparation of solid fuel (D) in the preparation of unbreakable glass
1 A,B,C only
2 B,C,D only
3 A,C,D only
4 All A,B,C,D
Explanation:
Acetaldehyde is an antiseptic inhalent in nose troubles. Paraldehyde (cyclic trimer of acetaldehyde) is hypnotic. Acetaldehyde can be used as a solid fuel.
CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS
323988
Assertion : Formaldehyde contains no alkyl group in its molecule. Reason : Formaldehyde condenses with phenol to give resin.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Formaldehyde is, Formaldehyde undergoes condensation with phenol, catalyzed by dilute \(\mathrm{NaOH}\) or ammonia at elevated temperatures, forming phenolformaldehyde resin (bakelite) through crosslinking, resulting in a strong and resilient threedimensional network structure. So the option (2) is correct.
