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Primary amines like CH₃CH₂CH₂NH₂ have higher boiling points due to extensive hydrogen bonding compared to secondary and tertiary amines, as per the PDF.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1
Propane-1,2-diol (CH₃CH(OH)CH₂OH) has two -OH groups, enhancing hydrogen bonding with water, making it more soluble than monohydric alcohols like propan-1-ol.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Preparation of Alcohols - from Alkenes Haloalkanes Carbonyls Grignard
Boiling point decreases with lower molecular weight. CH₃CH₂F has the lowest molecular weight among the options.
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Physical Properties - Boiling Point Dipole Moment Solubility
Amphibians have gills during their larval stage, while reptiles do not undergo such a transformation.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Amphibia and Reptilia
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